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Guide
This website contains an archive of files for the Acorn Electron, BBC Micro, Acorn Archimedes, Commodore 16 and Commodore 64 computers, which Dominic Ford has rescued from his private collection of floppy disks and cassettes.
Some of these files were originally commercial releases in the 1980s and 1990s, but they are now widely available online. I assume that copyright over them is no longer being asserted. If you own the copyright and would like files to be removed, please contact me.
Tape/disk: | Home » Personal collection » Acorn hard disk » apps » Astro |
Filename: | Guide |
Read OK: | ✔ |
File size: | 18A4 bytes |
Load address: | 0000 |
Exec address: | 0000 |
File contents
Sky guide � Alan Senior 1996 Version 0.16� --------- I haven't got around to writing a decent guide yet, however I expect you will not have too much trouble figuring out most of it. Here are a few notes to help you. 1. The program needs to run in a square pixel mode, otherwise the display looks dreadful. This means a multisync monitor is essential. 2. A lot of calculations are involved so an ARM3 or faster CPU is best. I use a RiscPC 600. It does work on my A3000 but is VERY slow. It seems that SIN and COS operations are pretty slow. I've pre-calculated and used SIN/COS tables where sensible. I can't wait to see how a StrongARM will run it! 3. The program is not finished.... hopefully it will be in a more presentable form with the Orrery and horizon display working properly at some point..... I've disabled/removed the horizon display and Orrery code on this copy. I Think there are enough features to show the programs potential and even in it's present form I find it useful. 4. It takes quite a while to load but does not require any disc accesses afterwards. 5. Click select on the icon bar to open the star window. There will be a short delay while the star and planet positions are calculated. 6. The button bar has the following functions, left to right they are: a) Horizon/sphere toggle (does not work in this copy, but the mouse 'adjust' button on this icon magnifies the star field display!!) b) RA and Declination controls pan and tilt the view point. The RA and Dec numers are those for the centre of the display area. c) Star count, shows the number of stars scanned for the set magnitude. d) Magnitude limit for the display - lower numbers mean faster redraw! The data base contains stars to magnitude 6.5 with a few down to magnitude 7 such as the "Coat hanger" near Sagitta. e) The group of 20 icons on the right in the button bar have the following functions, top row first: - Display lock, prevents update while various icons/time are changed. Normally the display is updated afer every change. - Stars on/off - Messier on/off - Constellation pattern on/off - Solar system objects (planets/moon etc) on/off - Grid on/off. The grid is at 30 minutes RA and 5 degree Dec intervals. - Object identification ring follows mouse pointer when on. - Toggle identification ring on/off - Open/close object information window (previous two icons are greyed out when the object info window is closed) - Open 'time setting' window The bottom row: - Real time update when pointer over window. updates display every minute - useful during eclipses - Toggle star names on/off. The number of star names that appear depends on the magnitude limit. There are just over 300 named stars. - Toggle messier reference on/off - Toggle constellation names on/off - Toggle solar system object names on/off - The last 4 are various zoom factors. The magnitude limit is automatically adjusted to a sensible value for different zoom factors. At level 1 zoom even the sprawling Eridanus fits in. At zoom level 4 Sagitta shows nicely. The Sun and moon are close to the correct "size" at zoom 4. The planets are always plotted too big! - Solar system object menu. Tick the ones to be displayed. 7. The menu in the star window can be used to find various things. Constellations are highlighted when found to assist identification. The Common names submenu allows patterns such as the "Teapot" or the "Winter Triangle" to be seen. These patterns clear when a new Constellation is selected. There are over 300 named stars in the menu! Stars can be found by their Bayer designation too. The data base contains all 110 Messier objects. I hope to add some of the more prominent NGC objects too. 8. Solar system objects are plotted in order of distance, so if Mercury is in front of the sun it is plotted in front! I havent put in the code to handle osculating elements yet so Pluto cannot be found. 9. The information window shows the horizon coordinates of any object. The distance of solar system objects is also shown. I havent got around to adding star/Messier distances mainly because I haven't found a data base with that information in! 10 The umbra/penumbra are plotted to the correct scale/size. The sun and moon are only the correct scale at zoom level 4 - remember this when you are looking at eclipses! The moons position is calculated from the surface of the earth - hence parallax is accounted for (the moon therefore appears to move as your latitude/longitude on the earth changes) 11 In the celestial sphere window, use the mouse "adjust" button with the pointer near an object to move it towards the centre. 12 In the celestial sphere window, use the mouse "select" button with the 'Object Information' window open to display data on the object. Alternatively turn on the identification ring and/or pointer tracking. 13 The Equatorial view displays a section of the sky along the ecliptic (where the planets tend to be). Select - updates the display Menu - gives some options Adjust - changes the star field magnifiation 14 All open windows update when the time is changed, the more open and the more solar system object displayed - the slower it goes because of all the calculations invoved! 15 The moon window shows the phase and the aparent inclination of the moons axis relative to the earths. 16 The location window allows your geographical position, the window can be edited but cannot be saved. Longitude must be in the range -180 (east) to +180 (west). ################################## As for possible future additions - the sky's the limit. I'd apreciate your comments/suggestions/bug reports. Internet: alan@comlink.demon.co.uk Packet: G7ALN@GB7IMB Snail mail: Alan Senior. 7A, Kelston Road, Keynsham, Bristol. BS18 2JH.
00000000 0a 53 6b 79 20 67 75 69 64 65 20 20 20 20 20 20 |.Sky guide | 00000010 20 20 20 20 20 20 20 20 20 20 20 20 a9 20 41 6c | . Al| 00000020 61 6e 20 53 65 6e 69 6f 72 20 31 39 39 36 20 20 |an Senior 1996 | 00000030 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 | | 00000040 56 65 72 73 69 6f 6e 20 30 2e 31 36 df 0a 2d 2d |Version 0.16..--| 00000050 2d 2d 2d 2d 2d 2d 2d 0a 0a 49 20 68 61 76 65 6e |-------..I haven| 00000060 27 74 20 67 6f 74 20 61 72 6f 75 6e 64 20 74 6f |'t got around to| 00000070 20 77 72 69 74 69 6e 67 20 61 20 64 65 63 65 6e | writing a decen| 00000080 74 20 67 75 69 64 65 20 79 65 74 2c 20 68 6f 77 |t guide yet, how| 00000090 65 76 65 72 20 49 20 65 78 70 65 63 74 20 79 6f |ever I expect yo| 000000a0 75 20 77 69 6c 6c 0a 6e 6f 74 20 68 61 76 65 20 |u will.not have | 000000b0 74 6f 6f 20 6d 75 63 68 20 74 72 6f 75 62 6c 65 |too much trouble| 000000c0 20 66 69 67 75 72 69 6e 67 20 6f 75 74 20 6d 6f | figuring out mo| 000000d0 73 74 20 6f 66 20 69 74 2e 20 48 65 72 65 20 61 |st of it. Here a| 000000e0 72 65 20 61 20 66 65 77 20 6e 6f 74 65 73 20 74 |re a few notes t| 000000f0 6f 0a 68 65 6c 70 20 79 6f 75 2e 0a 0a 31 2e 20 |o.help you...1. | 00000100 54 68 65 20 70 72 6f 67 72 61 6d 20 6e 65 65 64 |The program need| 00000110 73 20 74 6f 20 72 75 6e 20 69 6e 20 61 20 73 71 |s to run in a sq| 00000120 75 61 72 65 20 70 69 78 65 6c 20 6d 6f 64 65 2c |uare pixel mode,| 00000130 20 6f 74 68 65 72 77 69 73 65 20 74 68 65 20 64 | otherwise the d| 00000140 69 73 70 6c 61 79 0a 20 20 20 6c 6f 6f 6b 73 20 |isplay. looks | 00000150 64 72 65 61 64 66 75 6c 2e 20 54 68 69 73 20 6d |dreadful. This m| 00000160 65 61 6e 73 20 61 20 6d 75 6c 74 69 73 79 6e 63 |eans a multisync| 00000170 20 6d 6f 6e 69 74 6f 72 20 69 73 20 65 73 73 65 | monitor is esse| 00000180 6e 74 69 61 6c 2e 0a 0a 32 2e 20 41 20 6c 6f 74 |ntial...2. A lot| 00000190 20 6f 66 20 63 61 6c 63 75 6c 61 74 69 6f 6e 73 | of calculations| 000001a0 20 61 72 65 20 69 6e 76 6f 6c 76 65 64 20 73 6f | are involved so| 000001b0 20 61 6e 20 41 52 4d 33 20 6f 72 20 66 61 73 74 | an ARM3 or fast| 000001c0 65 72 20 43 50 55 20 69 73 20 62 65 73 74 2e 20 |er CPU is best. | 000001d0 49 0a 20 20 20 75 73 65 20 61 20 52 69 73 63 50 |I. use a RiscP| 000001e0 43 20 36 30 30 2e 20 49 74 20 64 6f 65 73 20 77 |C 600. It does w| 000001f0 6f 72 6b 20 6f 6e 20 6d 79 20 41 33 30 30 30 20 |ork on my A3000 | 00000200 62 75 74 20 69 73 20 56 45 52 59 20 73 6c 6f 77 |but is VERY slow| 00000210 2e 20 49 74 0a 20 20 20 73 65 65 6d 73 20 74 68 |. It. seems th| 00000220 61 74 20 53 49 4e 20 61 6e 64 20 43 4f 53 20 6f |at SIN and COS o| 00000230 70 65 72 61 74 69 6f 6e 73 20 61 72 65 20 70 72 |perations are pr| 00000240 65 74 74 79 20 73 6c 6f 77 2e 20 49 27 76 65 20 |etty slow. I've | 00000250 70 72 65 2d 63 61 6c 63 75 6c 61 74 65 64 0a 20 |pre-calculated. | 00000260 20 20 61 6e 64 20 75 73 65 64 20 53 49 4e 2f 43 | and used SIN/C| 00000270 4f 53 20 74 61 62 6c 65 73 20 77 68 65 72 65 20 |OS tables where | 00000280 73 65 6e 73 69 62 6c 65 2e 20 20 49 20 63 61 6e |sensible. I can| 00000290 27 74 20 77 61 69 74 20 74 6f 20 73 65 65 20 68 |'t wait to see h| 000002a0 6f 77 20 61 0a 20 20 20 53 74 72 6f 6e 67 41 52 |ow a. StrongAR| 000002b0 4d 20 77 69 6c 6c 20 72 75 6e 20 69 74 21 0a 0a |M will run it!..| 000002c0 33 2e 20 54 68 65 20 70 72 6f 67 72 61 6d 20 69 |3. The program i| 000002d0 73 20 6e 6f 74 20 66 69 6e 69 73 68 65 64 2e 2e |s not finished..| 000002e0 2e 2e 20 68 6f 70 65 66 75 6c 6c 79 20 69 74 20 |.. hopefully it | 000002f0 77 69 6c 6c 20 62 65 20 69 6e 20 61 20 6d 6f 72 |will be in a mor| 00000300 65 0a 20 20 20 70 72 65 73 65 6e 74 61 62 6c 65 |e. presentable| 00000310 20 66 6f 72 6d 20 77 69 74 68 20 74 68 65 20 4f | form with the O| 00000320 72 72 65 72 79 20 61 6e 64 20 68 6f 72 69 7a 6f |rrery and horizo| 00000330 6e 20 64 69 73 70 6c 61 79 20 77 6f 72 6b 69 6e |n display workin| 00000340 67 20 70 72 6f 70 65 72 6c 79 20 61 74 0a 20 20 |g properly at. | 00000350 20 73 6f 6d 65 20 70 6f 69 6e 74 2e 2e 2e 2e 2e | some point.....| 00000360 20 49 27 76 65 20 64 69 73 61 62 6c 65 64 2f 72 | I've disabled/r| 00000370 65 6d 6f 76 65 64 20 74 68 65 20 68 6f 72 69 7a |emoved the horiz| 00000380 6f 6e 20 64 69 73 70 6c 61 79 20 61 6e 64 20 4f |on display and O| 00000390 72 72 65 72 79 0a 20 20 20 63 6f 64 65 20 6f 6e |rrery. code on| 000003a0 20 74 68 69 73 20 63 6f 70 79 2e 20 49 20 54 68 | this copy. I Th| 000003b0 69 6e 6b 20 74 68 65 72 65 20 61 72 65 20 65 6e |ink there are en| 000003c0 6f 75 67 68 20 66 65 61 74 75 72 65 73 20 74 6f |ough features to| 000003d0 20 73 68 6f 77 20 74 68 65 20 70 72 6f 67 72 61 | show the progra| 000003e0 6d 73 0a 20 20 20 70 6f 74 65 6e 74 69 61 6c 20 |ms. potential | 000003f0 61 6e 64 20 65 76 65 6e 20 69 6e 20 69 74 27 73 |and even in it's| 00000400 20 70 72 65 73 65 6e 74 20 66 6f 72 6d 20 49 20 | present form I | 00000410 66 69 6e 64 20 69 74 20 75 73 65 66 75 6c 2e 0a |find it useful..| 00000420 0a 34 2e 20 49 74 20 74 61 6b 65 73 20 71 75 69 |.4. It takes qui| 00000430 74 65 20 61 20 77 68 69 6c 65 20 74 6f 20 6c 6f |te a while to lo| 00000440 61 64 20 62 75 74 20 64 6f 65 73 20 6e 6f 74 20 |ad but does not | 00000450 72 65 71 75 69 72 65 20 61 6e 79 20 64 69 73 63 |require any disc| 00000460 20 61 63 63 65 73 73 65 73 0a 20 20 20 61 66 74 | accesses. aft| 00000470 65 72 77 61 72 64 73 2e 0a 0a 35 2e 20 43 6c 69 |erwards...5. Cli| 00000480 63 6b 20 73 65 6c 65 63 74 20 6f 6e 20 74 68 65 |ck select on the| 00000490 20 69 63 6f 6e 20 62 61 72 20 74 6f 20 6f 70 65 | icon bar to ope| 000004a0 6e 20 74 68 65 20 73 74 61 72 20 77 69 6e 64 6f |n the star windo| 000004b0 77 2e 20 54 68 65 72 65 20 77 69 6c 6c 20 62 65 |w. There will be| 000004c0 20 61 0a 20 20 20 73 68 6f 72 74 20 64 65 6c 61 | a. short dela| 000004d0 79 20 77 68 69 6c 65 20 74 68 65 20 73 74 61 72 |y while the star| 000004e0 20 61 6e 64 20 70 6c 61 6e 65 74 20 70 6f 73 69 | and planet posi| 000004f0 74 69 6f 6e 73 20 61 72 65 20 63 61 6c 63 75 6c |tions are calcul| 00000500 61 74 65 64 2e 0a 0a 36 2e 20 54 68 65 20 62 75 |ated...6. The bu| 00000510 74 74 6f 6e 20 62 61 72 20 68 61 73 20 74 68 65 |tton bar has the| 00000520 20 66 6f 6c 6c 6f 77 69 6e 67 20 66 75 6e 63 74 | following funct| 00000530 69 6f 6e 73 2c 20 6c 65 66 74 20 74 6f 20 72 69 |ions, left to ri| 00000540 67 68 74 20 74 68 65 79 20 61 72 65 3a 0a 0a 20 |ght they are:.. | 00000550 20 20 61 29 20 48 6f 72 69 7a 6f 6e 2f 73 70 68 | a) Horizon/sph| 00000560 65 72 65 20 74 6f 67 67 6c 65 20 28 64 6f 65 73 |ere toggle (does| 00000570 20 6e 6f 74 20 77 6f 72 6b 20 69 6e 20 74 68 69 | not work in thi| 00000580 73 20 63 6f 70 79 2c 20 62 75 74 20 74 68 65 20 |s copy, but the | 00000590 6d 6f 75 73 65 0a 20 20 20 20 20 20 27 61 64 6a |mouse. 'adj| 000005a0 75 73 74 27 20 62 75 74 74 6f 6e 20 6f 6e 20 74 |ust' button on t| 000005b0 68 69 73 20 69 63 6f 6e 20 6d 61 67 6e 69 66 69 |his icon magnifi| 000005c0 65 73 20 74 68 65 20 73 74 61 72 20 66 69 65 6c |es the star fiel| 000005d0 64 20 64 69 73 70 6c 61 79 21 21 29 0a 20 20 20 |d display!!). | 000005e0 62 29 20 52 41 20 61 6e 64 20 44 65 63 6c 69 6e |b) RA and Declin| 000005f0 61 74 69 6f 6e 20 63 6f 6e 74 72 6f 6c 73 20 70 |ation controls p| 00000600 61 6e 20 61 6e 64 20 74 69 6c 74 20 74 68 65 20 |an and tilt the | 00000610 76 69 65 77 20 70 6f 69 6e 74 2e 20 54 68 65 20 |view point. The | 00000620 52 41 20 61 6e 64 0a 20 20 20 20 20 20 44 65 63 |RA and. Dec| 00000630 20 6e 75 6d 65 72 73 20 61 72 65 20 74 68 6f 73 | numers are thos| 00000640 65 20 66 6f 72 20 74 68 65 20 63 65 6e 74 72 65 |e for the centre| 00000650 20 6f 66 20 74 68 65 20 64 69 73 70 6c 61 79 20 | of the display | 00000660 61 72 65 61 2e 0a 20 20 20 63 29 20 53 74 61 72 |area.. c) Star| 00000670 20 63 6f 75 6e 74 2c 20 73 68 6f 77 73 20 74 68 | count, shows th| 00000680 65 20 6e 75 6d 62 65 72 20 6f 66 20 73 74 61 72 |e number of star| 00000690 73 20 73 63 61 6e 6e 65 64 20 66 6f 72 20 74 68 |s scanned for th| 000006a0 65 20 73 65 74 20 6d 61 67 6e 69 74 75 64 65 2e |e set magnitude.| 000006b0 0a 20 20 20 64 29 20 4d 61 67 6e 69 74 75 64 65 |. d) Magnitude| 000006c0 20 6c 69 6d 69 74 20 66 6f 72 20 74 68 65 20 64 | limit for the d| 000006d0 69 73 70 6c 61 79 20 2d 20 6c 6f 77 65 72 20 6e |isplay - lower n| 000006e0 75 6d 62 65 72 73 20 6d 65 61 6e 20 66 61 73 74 |umbers mean fast| 000006f0 65 72 20 72 65 64 72 61 77 21 0a 20 20 20 20 20 |er redraw!. | 00000700 20 54 68 65 20 64 61 74 61 20 62 61 73 65 20 63 | The data base c| 00000710 6f 6e 74 61 69 6e 73 20 73 74 61 72 73 20 74 6f |ontains stars to| 00000720 20 6d 61 67 6e 69 74 75 64 65 20 36 2e 35 20 77 | magnitude 6.5 w| 00000730 69 74 68 20 61 20 66 65 77 20 64 6f 77 6e 20 74 |ith a few down t| 00000740 6f 0a 20 20 20 20 20 20 6d 61 67 6e 69 74 75 64 |o. magnitud| 00000750 65 20 37 20 73 75 63 68 20 61 73 20 74 68 65 20 |e 7 such as the | 00000760 22 43 6f 61 74 20 68 61 6e 67 65 72 22 20 6e 65 |"Coat hanger" ne| 00000770 61 72 20 53 61 67 69 74 74 61 2e 0a 20 20 20 65 |ar Sagitta.. e| 00000780 29 20 54 68 65 20 67 72 6f 75 70 20 6f 66 20 32 |) The group of 2| 00000790 30 20 69 63 6f 6e 73 20 6f 6e 20 74 68 65 20 72 |0 icons on the r| 000007a0 69 67 68 74 20 69 6e 20 74 68 65 20 62 75 74 74 |ight in the butt| 000007b0 6f 6e 20 62 61 72 20 68 61 76 65 20 74 68 65 0a |on bar have the.| 000007c0 20 20 20 20 20 20 66 6f 6c 6c 6f 77 69 6e 67 20 | following | 000007d0 66 75 6e 63 74 69 6f 6e 73 2c 20 74 6f 70 20 72 |functions, top r| 000007e0 6f 77 20 66 69 72 73 74 3a 0a 0a 20 20 20 20 20 |ow first:.. | 000007f0 20 2d 20 44 69 73 70 6c 61 79 20 6c 6f 63 6b 2c | - Display lock,| 00000800 20 70 72 65 76 65 6e 74 73 20 75 70 64 61 74 65 | prevents update| 00000810 20 77 68 69 6c 65 20 76 61 72 69 6f 75 73 20 69 | while various i| 00000820 63 6f 6e 73 2f 74 69 6d 65 20 61 72 65 20 63 68 |cons/time are ch| 00000830 61 6e 67 65 64 2e 0a 20 20 20 20 20 20 20 20 4e |anged.. N| 00000840 6f 72 6d 61 6c 6c 79 20 74 68 65 20 64 69 73 70 |ormally the disp| 00000850 6c 61 79 20 69 73 20 75 70 64 61 74 65 64 20 61 |lay is updated a| 00000860 66 65 72 20 65 76 65 72 79 20 63 68 61 6e 67 65 |fer every change| 00000870 2e 0a 0a 20 20 20 20 20 20 2d 20 53 74 61 72 73 |... - Stars| 00000880 20 6f 6e 2f 6f 66 66 0a 0a 20 20 20 20 20 20 2d | on/off.. -| 00000890 20 4d 65 73 73 69 65 72 20 6f 6e 2f 6f 66 66 0a | Messier on/off.| 000008a0 0a 20 20 20 20 20 20 2d 20 43 6f 6e 73 74 65 6c |. - Constel| 000008b0 6c 61 74 69 6f 6e 20 70 61 74 74 65 72 6e 20 6f |lation pattern o| 000008c0 6e 2f 6f 66 66 0a 0a 20 20 20 20 20 20 2d 20 53 |n/off.. - S| 000008d0 6f 6c 61 72 20 73 79 73 74 65 6d 20 6f 62 6a 65 |olar system obje| 000008e0 63 74 73 20 28 70 6c 61 6e 65 74 73 2f 6d 6f 6f |cts (planets/moo| 000008f0 6e 20 65 74 63 29 20 6f 6e 2f 6f 66 66 0a 0a 20 |n etc) on/off.. | 00000900 20 20 20 20 20 2d 20 47 72 69 64 20 6f 6e 2f 6f | - Grid on/o| 00000910 66 66 2e 20 54 68 65 20 67 72 69 64 20 69 73 20 |ff. The grid is | 00000920 61 74 20 33 30 20 6d 69 6e 75 74 65 73 20 52 41 |at 30 minutes RA| 00000930 20 61 6e 64 20 35 20 64 65 67 72 65 65 20 44 65 | and 5 degree De| 00000940 63 0a 20 20 20 20 20 20 20 20 69 6e 74 65 72 76 |c. interv| 00000950 61 6c 73 2e 0a 0a 20 20 20 20 20 20 2d 20 4f 62 |als... - Ob| 00000960 6a 65 63 74 20 69 64 65 6e 74 69 66 69 63 61 74 |ject identificat| 00000970 69 6f 6e 20 72 69 6e 67 20 66 6f 6c 6c 6f 77 73 |ion ring follows| 00000980 20 6d 6f 75 73 65 20 70 6f 69 6e 74 65 72 20 77 | mouse pointer w| 00000990 68 65 6e 20 6f 6e 2e 0a 0a 20 20 20 20 20 20 2d |hen on... -| 000009a0 20 54 6f 67 67 6c 65 20 69 64 65 6e 74 69 66 69 | Toggle identifi| 000009b0 63 61 74 69 6f 6e 20 72 69 6e 67 20 6f 6e 2f 6f |cation ring on/o| 000009c0 66 66 0a 0a 20 20 20 20 20 20 2d 20 4f 70 65 6e |ff.. - Open| 000009d0 2f 63 6c 6f 73 65 20 6f 62 6a 65 63 74 20 69 6e |/close object in| 000009e0 66 6f 72 6d 61 74 69 6f 6e 20 77 69 6e 64 6f 77 |formation window| 000009f0 20 28 70 72 65 76 69 6f 75 73 20 74 77 6f 20 69 | (previous two i| 00000a00 63 6f 6e 73 20 61 72 65 20 67 72 65 79 65 64 0a |cons are greyed.| 00000a10 20 20 20 20 20 20 20 20 6f 75 74 20 77 68 65 6e | out when| 00000a20 20 74 68 65 20 6f 62 6a 65 63 74 20 69 6e 66 6f | the object info| 00000a30 20 77 69 6e 64 6f 77 20 69 73 20 63 6c 6f 73 65 | window is close| 00000a40 64 29 0a 0a 20 20 20 20 20 20 2d 20 4f 70 65 6e |d).. - Open| 00000a50 20 27 74 69 6d 65 20 73 65 74 74 69 6e 67 27 20 | 'time setting' | 00000a60 77 69 6e 64 6f 77 0a 0a 20 20 20 20 20 20 54 68 |window.. Th| 00000a70 65 20 62 6f 74 74 6f 6d 20 72 6f 77 3a 0a 0a 20 |e bottom row:.. | 00000a80 20 20 20 20 20 2d 20 52 65 61 6c 20 74 69 6d 65 | - Real time| 00000a90 20 75 70 64 61 74 65 20 77 68 65 6e 20 70 6f 69 | update when poi| 00000aa0 6e 74 65 72 20 6f 76 65 72 20 77 69 6e 64 6f 77 |nter over window| 00000ab0 2e 20 20 75 70 64 61 74 65 73 20 64 69 73 70 6c |. updates displ| 00000ac0 61 79 20 65 76 65 72 79 0a 20 20 20 20 20 20 20 |ay every. | 00000ad0 20 6d 69 6e 75 74 65 20 2d 20 75 73 65 66 75 6c | minute - useful| 00000ae0 20 64 75 72 69 6e 67 20 65 63 6c 69 70 73 65 73 | during eclipses| 00000af0 0a 0a 20 20 20 20 20 20 2d 20 54 6f 67 67 6c 65 |.. - Toggle| 00000b00 20 73 74 61 72 20 6e 61 6d 65 73 20 6f 6e 2f 6f | star names on/o| 00000b10 66 66 2e 20 54 68 65 20 6e 75 6d 62 65 72 20 6f |ff. The number o| 00000b20 66 20 73 74 61 72 20 6e 61 6d 65 73 20 74 68 61 |f star names tha| 00000b30 74 20 61 70 70 65 61 72 0a 20 20 20 20 20 20 20 |t appear. | 00000b40 20 64 65 70 65 6e 64 73 20 6f 6e 20 74 68 65 20 | depends on the | 00000b50 6d 61 67 6e 69 74 75 64 65 20 6c 69 6d 69 74 2e |magnitude limit.| 00000b60 20 54 68 65 72 65 20 61 72 65 20 6a 75 73 74 20 | There are just | 00000b70 6f 76 65 72 20 33 30 30 20 6e 61 6d 65 64 20 73 |over 300 named s| 00000b80 74 61 72 73 2e 0a 0a 20 20 20 20 20 20 2d 20 54 |tars... - T| 00000b90 6f 67 67 6c 65 20 6d 65 73 73 69 65 72 20 72 65 |oggle messier re| 00000ba0 66 65 72 65 6e 63 65 20 6f 6e 2f 6f 66 66 0a 0a |ference on/off..| 00000bb0 20 20 20 20 20 20 2d 20 54 6f 67 67 6c 65 20 63 | - Toggle c| 00000bc0 6f 6e 73 74 65 6c 6c 61 74 69 6f 6e 20 6e 61 6d |onstellation nam| 00000bd0 65 73 20 6f 6e 2f 6f 66 66 0a 0a 20 20 20 20 20 |es on/off.. | 00000be0 20 2d 20 54 6f 67 67 6c 65 20 73 6f 6c 61 72 20 | - Toggle solar | 00000bf0 73 79 73 74 65 6d 20 6f 62 6a 65 63 74 20 6e 61 |system object na| 00000c00 6d 65 73 20 6f 6e 2f 6f 66 66 0a 0a 20 20 20 20 |mes on/off.. | 00000c10 20 20 2d 20 54 68 65 20 6c 61 73 74 20 34 20 61 | - The last 4 a| 00000c20 72 65 20 76 61 72 69 6f 75 73 20 7a 6f 6f 6d 20 |re various zoom | 00000c30 66 61 63 74 6f 72 73 2e 20 54 68 65 20 6d 61 67 |factors. The mag| 00000c40 6e 69 74 75 64 65 20 6c 69 6d 69 74 20 69 73 0a |nitude limit is.| 00000c50 20 20 20 20 20 20 20 20 61 75 74 6f 6d 61 74 69 | automati| 00000c60 63 61 6c 6c 79 20 61 64 6a 75 73 74 65 64 20 74 |cally adjusted t| 00000c70 6f 20 61 20 73 65 6e 73 69 62 6c 65 20 76 61 6c |o a sensible val| 00000c80 75 65 20 66 6f 72 20 64 69 66 66 65 72 65 6e 74 |ue for different| 00000c90 20 7a 6f 6f 6d 0a 20 20 20 20 20 20 20 20 66 61 | zoom. fa| 00000ca0 63 74 6f 72 73 2e 20 41 74 20 6c 65 76 65 6c 20 |ctors. At level | 00000cb0 31 20 7a 6f 6f 6d 20 65 76 65 6e 20 74 68 65 20 |1 zoom even the | 00000cc0 73 70 72 61 77 6c 69 6e 67 20 45 72 69 64 61 6e |sprawling Eridan| 00000cd0 75 73 20 66 69 74 73 20 69 6e 2e 20 41 74 0a 20 |us fits in. At. | 00000ce0 20 20 20 20 20 20 20 7a 6f 6f 6d 20 6c 65 76 65 | zoom leve| 00000cf0 6c 20 34 20 53 61 67 69 74 74 61 20 73 68 6f 77 |l 4 Sagitta show| 00000d00 73 20 6e 69 63 65 6c 79 2e 20 54 68 65 20 53 75 |s nicely. The Su| 00000d10 6e 20 61 6e 64 20 6d 6f 6f 6e 20 61 72 65 20 63 |n and moon are c| 00000d20 6c 6f 73 65 20 74 6f 20 74 68 65 0a 20 20 20 20 |lose to the. | 00000d30 20 20 20 20 63 6f 72 72 65 63 74 20 22 73 69 7a | correct "siz| 00000d40 65 22 20 61 74 20 7a 6f 6f 6d 20 34 2e 20 54 68 |e" at zoom 4. Th| 00000d50 65 20 70 6c 61 6e 65 74 73 20 61 72 65 20 61 6c |e planets are al| 00000d60 77 61 79 73 20 70 6c 6f 74 74 65 64 20 74 6f 6f |ways plotted too| 00000d70 20 62 69 67 21 0a 0a 20 20 20 20 20 20 2d 20 53 | big!.. - S| 00000d80 6f 6c 61 72 20 73 79 73 74 65 6d 20 6f 62 6a 65 |olar system obje| 00000d90 63 74 20 6d 65 6e 75 2e 20 54 69 63 6b 20 74 68 |ct menu. Tick th| 00000da0 65 20 6f 6e 65 73 20 74 6f 20 62 65 20 64 69 73 |e ones to be dis| 00000db0 70 6c 61 79 65 64 2e 0a 0a 37 2e 20 54 68 65 20 |played...7. The | 00000dc0 6d 65 6e 75 20 69 6e 20 74 68 65 20 73 74 61 72 |menu in the star| 00000dd0 20 77 69 6e 64 6f 77 20 63 61 6e 20 62 65 20 75 | window can be u| 00000de0 73 65 64 20 74 6f 20 66 69 6e 64 20 76 61 72 69 |sed to find vari| 00000df0 6f 75 73 20 74 68 69 6e 67 73 2e 0a 20 20 20 43 |ous things.. C| 00000e00 6f 6e 73 74 65 6c 6c 61 74 69 6f 6e 73 20 61 72 |onstellations ar| 00000e10 65 20 68 69 67 68 6c 69 67 68 74 65 64 20 77 68 |e highlighted wh| 00000e20 65 6e 20 66 6f 75 6e 64 20 74 6f 20 61 73 73 69 |en found to assi| 00000e30 73 74 20 69 64 65 6e 74 69 66 69 63 61 74 69 6f |st identificatio| 00000e40 6e 2e 20 54 68 65 0a 20 20 20 43 6f 6d 6d 6f 6e |n. The. Common| 00000e50 20 6e 61 6d 65 73 20 73 75 62 6d 65 6e 75 20 61 | names submenu a| 00000e60 6c 6c 6f 77 73 20 70 61 74 74 65 72 6e 73 20 73 |llows patterns s| 00000e70 75 63 68 20 61 73 20 74 68 65 20 22 54 65 61 70 |uch as the "Teap| 00000e80 6f 74 22 20 6f 72 20 74 68 65 20 22 57 69 6e 74 |ot" or the "Wint| 00000e90 65 72 0a 20 20 20 54 72 69 61 6e 67 6c 65 22 20 |er. Triangle" | 00000ea0 74 6f 20 62 65 20 73 65 65 6e 2e 20 54 68 65 73 |to be seen. Thes| 00000eb0 65 20 70 61 74 74 65 72 6e 73 20 63 6c 65 61 72 |e patterns clear| 00000ec0 20 77 68 65 6e 20 61 20 6e 65 77 20 43 6f 6e 73 | when a new Cons| 00000ed0 74 65 6c 6c 61 74 69 6f 6e 20 69 73 0a 20 20 20 |tellation is. | 00000ee0 73 65 6c 65 63 74 65 64 2e 20 54 68 65 72 65 20 |selected. There | 00000ef0 61 72 65 20 6f 76 65 72 20 33 30 30 20 6e 61 6d |are over 300 nam| 00000f00 65 64 20 73 74 61 72 73 20 69 6e 20 74 68 65 20 |ed stars in the | 00000f10 6d 65 6e 75 21 20 53 74 61 72 73 20 63 61 6e 20 |menu! Stars can | 00000f20 62 65 20 66 6f 75 6e 64 0a 20 20 20 62 79 20 74 |be found. by t| 00000f30 68 65 69 72 20 42 61 79 65 72 20 64 65 73 69 67 |heir Bayer desig| 00000f40 6e 61 74 69 6f 6e 20 74 6f 6f 2e 20 54 68 65 20 |nation too. The | 00000f50 64 61 74 61 20 62 61 73 65 20 63 6f 6e 74 61 69 |data base contai| 00000f60 6e 73 20 61 6c 6c 20 31 31 30 20 4d 65 73 73 69 |ns all 110 Messi| 00000f70 65 72 0a 20 20 20 6f 62 6a 65 63 74 73 2e 20 49 |er. objects. I| 00000f80 20 68 6f 70 65 20 74 6f 20 61 64 64 20 73 6f 6d | hope to add som| 00000f90 65 20 6f 66 20 74 68 65 20 6d 6f 72 65 20 70 72 |e of the more pr| 00000fa0 6f 6d 69 6e 65 6e 74 20 4e 47 43 20 6f 62 6a 65 |ominent NGC obje| 00000fb0 63 74 73 20 74 6f 6f 2e 0a 0a 38 2e 20 53 6f 6c |cts too...8. Sol| 00000fc0 61 72 20 73 79 73 74 65 6d 20 6f 62 6a 65 63 74 |ar system object| 00000fd0 73 20 61 72 65 20 70 6c 6f 74 74 65 64 20 69 6e |s are plotted in| 00000fe0 20 6f 72 64 65 72 20 6f 66 20 64 69 73 74 61 6e | order of distan| 00000ff0 63 65 2c 20 73 6f 20 69 66 20 4d 65 72 63 75 72 |ce, so if Mercur| 00001000 79 20 69 73 0a 20 20 20 69 6e 20 66 72 6f 6e 74 |y is. in front| 00001010 20 6f 66 20 74 68 65 20 73 75 6e 20 69 74 20 69 | of the sun it i| 00001020 73 20 70 6c 6f 74 74 65 64 20 69 6e 20 66 72 6f |s plotted in fro| 00001030 6e 74 21 20 49 20 68 61 76 65 6e 74 20 70 75 74 |nt! I havent put| 00001040 20 69 6e 20 74 68 65 20 63 6f 64 65 20 74 6f 0a | in the code to.| 00001050 20 20 20 68 61 6e 64 6c 65 20 6f 73 63 75 6c 61 | handle oscula| 00001060 74 69 6e 67 20 65 6c 65 6d 65 6e 74 73 20 79 65 |ting elements ye| 00001070 74 20 73 6f 20 50 6c 75 74 6f 20 63 61 6e 6e 6f |t so Pluto canno| 00001080 74 20 62 65 20 66 6f 75 6e 64 2e 0a 0a 39 2e 20 |t be found...9. | 00001090 54 68 65 20 69 6e 66 6f 72 6d 61 74 69 6f 6e 20 |The information | 000010a0 77 69 6e 64 6f 77 20 73 68 6f 77 73 20 74 68 65 |window shows the| 000010b0 20 68 6f 72 69 7a 6f 6e 20 63 6f 6f 72 64 69 6e | horizon coordin| 000010c0 61 74 65 73 20 6f 66 20 61 6e 79 20 6f 62 6a 65 |ates of any obje| 000010d0 63 74 2e 20 54 68 65 0a 20 20 20 64 69 73 74 61 |ct. The. dista| 000010e0 6e 63 65 20 6f 66 20 73 6f 6c 61 72 20 73 79 73 |nce of solar sys| 000010f0 74 65 6d 20 6f 62 6a 65 63 74 73 20 69 73 20 61 |tem objects is a| 00001100 6c 73 6f 20 73 68 6f 77 6e 2e 20 49 20 68 61 76 |lso shown. I hav| 00001110 65 6e 74 20 67 6f 74 20 61 72 6f 75 6e 64 20 74 |ent got around t| 00001120 6f 0a 20 20 20 61 64 64 69 6e 67 20 73 74 61 72 |o. adding star| 00001130 2f 4d 65 73 73 69 65 72 20 64 69 73 74 61 6e 63 |/Messier distanc| 00001140 65 73 20 6d 61 69 6e 6c 79 20 62 65 63 61 75 73 |es mainly becaus| 00001150 65 20 49 20 68 61 76 65 6e 27 74 20 66 6f 75 6e |e I haven't foun| 00001160 64 20 61 20 64 61 74 61 20 62 61 73 65 0a 20 20 |d a data base. | 00001170 20 77 69 74 68 20 74 68 61 74 20 69 6e 66 6f 72 | with that infor| 00001180 6d 61 74 69 6f 6e 20 69 6e 21 0a 0a 31 30 20 54 |mation in!..10 T| 00001190 68 65 20 75 6d 62 72 61 2f 70 65 6e 75 6d 62 72 |he umbra/penumbr| 000011a0 61 20 61 72 65 20 70 6c 6f 74 74 65 64 20 74 6f |a are plotted to| 000011b0 20 74 68 65 20 63 6f 72 72 65 63 74 20 73 63 61 | the correct sca| 000011c0 6c 65 2f 73 69 7a 65 2e 20 20 54 68 65 20 73 75 |le/size. The su| 000011d0 6e 20 61 6e 64 0a 20 20 20 6d 6f 6f 6e 20 61 72 |n and. moon ar| 000011e0 65 20 6f 6e 6c 79 20 74 68 65 20 63 6f 72 72 65 |e only the corre| 000011f0 63 74 20 73 63 61 6c 65 20 61 74 20 7a 6f 6f 6d |ct scale at zoom| 00001200 20 6c 65 76 65 6c 20 34 20 2d 20 72 65 6d 65 6d | level 4 - remem| 00001210 62 65 72 20 74 68 69 73 20 77 68 65 6e 20 79 6f |ber this when yo| 00001220 75 0a 20 20 20 61 72 65 20 6c 6f 6f 6b 69 6e 67 |u. are looking| 00001230 20 61 74 20 65 63 6c 69 70 73 65 73 21 20 20 54 | at eclipses! T| 00001240 68 65 20 6d 6f 6f 6e 73 20 70 6f 73 69 74 69 6f |he moons positio| 00001250 6e 20 69 73 20 63 61 6c 63 75 6c 61 74 65 64 20 |n is calculated | 00001260 66 72 6f 6d 20 74 68 65 0a 20 20 20 73 75 72 66 |from the. surf| 00001270 61 63 65 20 6f 66 20 74 68 65 20 65 61 72 74 68 |ace of the earth| 00001280 20 2d 20 68 65 6e 63 65 20 70 61 72 61 6c 6c 61 | - hence paralla| 00001290 78 20 69 73 20 61 63 63 6f 75 6e 74 65 64 20 66 |x is accounted f| 000012a0 6f 72 20 28 74 68 65 20 6d 6f 6f 6e 0a 20 20 20 |or (the moon. | 000012b0 74 68 65 72 65 66 6f 72 65 20 61 70 70 65 61 72 |therefore appear| 000012c0 73 20 74 6f 20 6d 6f 76 65 20 61 73 20 79 6f 75 |s to move as you| 000012d0 72 20 6c 61 74 69 74 75 64 65 2f 6c 6f 6e 67 69 |r latitude/longi| 000012e0 74 75 64 65 20 6f 6e 20 74 68 65 20 65 61 72 74 |tude on the eart| 000012f0 68 0a 20 20 20 63 68 61 6e 67 65 73 29 0a 0a 31 |h. changes)..1| 00001300 31 20 49 6e 20 74 68 65 20 63 65 6c 65 73 74 69 |1 In the celesti| 00001310 61 6c 20 73 70 68 65 72 65 20 77 69 6e 64 6f 77 |al sphere window| 00001320 2c 20 75 73 65 20 74 68 65 20 6d 6f 75 73 65 20 |, use the mouse | 00001330 22 61 64 6a 75 73 74 22 20 62 75 74 74 6f 6e 20 |"adjust" button | 00001340 77 69 74 68 20 74 68 65 0a 20 20 20 70 6f 69 6e |with the. poin| 00001350 74 65 72 20 6e 65 61 72 20 61 6e 20 6f 62 6a 65 |ter near an obje| 00001360 63 74 20 74 6f 20 6d 6f 76 65 20 69 74 20 74 6f |ct to move it to| 00001370 77 61 72 64 73 20 74 68 65 20 63 65 6e 74 72 65 |wards the centre| 00001380 2e 0a 0a 31 32 20 49 6e 20 74 68 65 20 63 65 6c |...12 In the cel| 00001390 65 73 74 69 61 6c 20 73 70 68 65 72 65 20 77 69 |estial sphere wi| 000013a0 6e 64 6f 77 2c 20 75 73 65 20 74 68 65 20 6d 6f |ndow, use the mo| 000013b0 75 73 65 20 22 73 65 6c 65 63 74 22 20 62 75 74 |use "select" but| 000013c0 74 6f 6e 20 77 69 74 68 20 74 68 65 0a 20 20 20 |ton with the. | 000013d0 27 4f 62 6a 65 63 74 20 49 6e 66 6f 72 6d 61 74 |'Object Informat| 000013e0 69 6f 6e 27 20 77 69 6e 64 6f 77 20 6f 70 65 6e |ion' window open| 000013f0 20 74 6f 20 64 69 73 70 6c 61 79 20 64 61 74 61 | to display data| 00001400 20 6f 6e 20 74 68 65 20 6f 62 6a 65 63 74 2e 0a | on the object..| 00001410 20 20 20 41 6c 74 65 72 6e 61 74 69 76 65 6c 79 | Alternatively| 00001420 20 74 75 72 6e 20 6f 6e 20 74 68 65 20 69 64 65 | turn on the ide| 00001430 6e 74 69 66 69 63 61 74 69 6f 6e 20 72 69 6e 67 |ntification ring| 00001440 20 61 6e 64 2f 6f 72 20 70 6f 69 6e 74 65 72 20 | and/or pointer | 00001450 74 72 61 63 6b 69 6e 67 2e 0a 0a 31 33 20 54 68 |tracking...13 Th| 00001460 65 20 45 71 75 61 74 6f 72 69 61 6c 20 76 69 65 |e Equatorial vie| 00001470 77 20 64 69 73 70 6c 61 79 73 20 61 20 73 65 63 |w displays a sec| 00001480 74 69 6f 6e 20 6f 66 20 74 68 65 20 73 6b 79 20 |tion of the sky | 00001490 61 6c 6f 6e 67 20 74 68 65 20 65 63 6c 69 70 74 |along the eclipt| 000014a0 69 63 0a 20 20 20 28 77 68 65 72 65 20 74 68 65 |ic. 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Internet| 000017d0 3a 20 20 20 20 61 6c 61 6e 40 63 6f 6d 6c 69 6e |: alan@comlin| 000017e0 6b 2e 64 65 6d 6f 6e 2e 63 6f 2e 75 6b 0a 20 20 |k.demon.co.uk. | 000017f0 20 20 20 50 61 63 6b 65 74 3a 20 20 20 20 20 20 | Packet: | 00001800 47 37 41 4c 4e 40 47 42 37 49 4d 42 0a 0a 20 20 |G7ALN@GB7IMB.. | 00001810 20 20 20 53 6e 61 69 6c 20 6d 61 69 6c 3a 20 20 | Snail mail: | 00001820 41 6c 61 6e 20 53 65 6e 69 6f 72 2e 0a 20 20 20 |Alan Senior.. | 00001830 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 37 | 7| 00001840 41 2c 20 4b 65 6c 73 74 6f 6e 20 52 6f 61 64 2c |A, Kelston Road,| 00001850 0a 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 |. | 00001860 20 20 20 4b 65 79 6e 73 68 61 6d 2c 0a 20 20 20 | Keynsham,. | 00001870 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 42 | B| 00001880 72 69 73 74 6f 6c 2e 0a 20 20 20 20 20 20 20 20 |ristol.. | 00001890 20 20 20 20 20 20 20 20 20 20 42 53 31 38 20 32 | BS18 2| 000018a0 4a 48 2e 0a |JH..| 000018a4