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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|
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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|
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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|
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00000360  20 49 27 76 65 20 64 69  73 61 62 6c 65 64 2f 72  | I've disabled/r|
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00000af0  0a 0a 20 20 20 20 20 20  2d 20 54 6f 67 67 6c 65  |..      - Toggle|
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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 |
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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|
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*
00001750  0a 0a 0a 41 73 20 66 6f  72 20 70 6f 73 73 69 62  |...As for possib|
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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,.   |
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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