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The Stars: A new way to see them...

Posted: 10.02.2004, 09:16
by Wizard
... is a book written by H.A.Rey. Within it are some of the clearest and best representations of star patterns I have seen. Many of you are probably familiar with them. (Gemini in Celestia is a Rey pattern).

The following image shows the default patterns for a number of constellations.
Image

Pictured below are the same constellations using Rey's patterns.
Image

To use the new patterns simply overwrite the existing asterisms.dat file found in the Celestia/data folder with the new asterisms.dat file found here Rey's Asterisms

It might be wise to backup the original asterisms.dat file first. Anyone who is involved with education might find these constellation patterns particularly helpful.

Posted: 10.02.2004, 12:36
by ElPelado
Very nice! If I have to choose, I prefer Rey's patterns...

Posted: 10.02.2004, 16:51
by Evil Dr Ganymede
Wow. All of a sudden, constellations actually make sense! Though Auriga still looks like a big box. :)

Reminds me of the Not The Nine O'Clock News 1982 calendar (NTNOCN was a very old britcom which launched the careers of Griff Rhys Jones, Mel Smith, Rowan Atkinson and I think Ben Elton). They had a bit in the middle of that showing some new constellations, including 'Magnum Rem' (the Big Thing - basically a join-the-dots of stars that made a random shape) and the Charioteer (a picture of a hugely detailed, intricate chariot with 6 horses, constructed from just two stars :) ).

Posted: 10.02.2004, 20:13
by granthutchison
Evil Dr Ganymede wrote:(NTNOCN was a very old britcom which launched the careers of Griff Rhys Jones, Mel Smith, Rowan Atkinson and I think Ben Elton).
Hello-o-o?
Pamela Stephenson, for crying out loud. Not in the least like Ben Elton. (I still recall her rendition of "I like trucking" very fondly indeed.)
I still have a copy of that calendar, sadly enough.

Grant

Re: The Stars: A new way to see them...

Posted: 11.02.2004, 00:40
by t00fri
Wizard wrote:... is a book written by H.A.Rey. Within it are some of the clearest and best representations of star patterns I have seen. Many of you are probably familiar with them. (Gemini in Celestia is a Rey pattern).

....

It might be wise to backup the original asterisms.dat file first. Anyone who is involved with education might find these constellation patterns particularly helpful.


A long time ago (early in 2002), when I made the asterisms of the Celestia distribution we had of course a broad discussion about other alternative constellation figures. Here is some of what I wrote about that matter as a remainder:

===========historical===============

The "global" expert on these figures seems to be Chris Marriott ( SkyMap Pro8), http://skymap.com/. The constellation figures in XEphem are also by him. On
http://skymap.com/constellations.htm, there are various configuration files for
free download that were submitted by SkyMap users and contain the stick-figures
corresponding to well known atlases, like:

1) Based on the popular Nature Company Guide books
; "Skywatching by D. Levy",
; "Advanced Skywatching by R.Burnham, A.Dyer, R.Garfinkle, M.George, J.Kanipe,
D.Levy"

These figures are /complete/(88/89) and associated with a quite experienced
astro-popularizer: D. Levy. They have some appealing simplicity in
favour. Yet a number of constellations seemed /too/ simplistic;-). My
new design for Celestia is substantially based on that set and, of
course, on a large amount of hand-editing. Also, my 12 year
association with XEphem cannot be denied...

2) On the other end of the spectrum is an amazingly fancy set, but
it may well be too fancy, I think (involving too weak stars, etc):

; Constellation figures based on H. A. Rey's "The Stars", published
; by Houghton Mifflin Co., Boston
;
; Adapted by Tracy Williams (tcw@iname.com), January 1999, with
; assistance from Robert Wade's Sky Map Pro 4 figures, where applicable.

3) "The Observer's Sky Atlas" by E. Karkoschka.

2) From the constellation maps from Anton?n R?kl from "Souhvezd?", published
by Artia, Prague in 1971 and from second book with unknown original
title (spanish translated title is "Estrellas y Planetas") published 1988
by Artia, Prague in 1988


As a basis for my designs, I have coded a Perl script (asterism.pl)
that 'elegantly' converts any desired set from
http://skymap.com/constellations.htm into Celestia format.

Anyone who is interested to play with different|further sets including
the above, may get it from me by email. Or, if preferred, I also have
of course the already converted asterism*.dat files: asterisms-hareyv5.dat,
asterisms-skywatch.dat, asterisms-rukl.dat, asterisms-karkoschka.dat, ...
( note that asterisms-hareyv5.dat sometimes refers to 'unnamed' stars;-), but
this is not too bad)

Of course, my final design in the CVS tree may also be obtained by email.
If a larger number of people turn out to be interested, we can also
put the new asterism.dat file to Bruckner's.

The basic strategy I applied was to try and find a good compromise
between a /conspicuously mnemnonic/ drawing (e.g. Gemini, Orion, Taurus,
Canis minor, Scorpius, Perseus, Hercules, Libra, ...), /popularity/ of
the figures (Ursa major/minor, Andromeda, Cassiopeia, Lyra, Virgo,...)
and /simplicity/, i.e. the restriction to sufficiently bright stars.

Any feedback is greatly appreciated...


Bye Fridger

================================

I have generated many different constellation files by means of my Perl script. The one above by Wizard probaly has also been generated by my 'asterism.pl' script, since the Gemini format/pattern is absolutely identical...I have about four or five others. Let me know if there is renewed interest.

It is always good style/fair to cite the 'maker' of such things...

Bye Fridger

Posted: 11.02.2004, 09:27
by Wizard
Hi t00fri,

I would be very interested in having a look at the alternative asterisms. I did a search for Rey's asterisms prior to constructing them and did note you had developed a perl script. My problem was I had, and still have, no idea how to use a perl script :) I would like to assure you that I did not use your perl generated .dat files. I have no idea what your asterism.dat file looks when viewed with a text editor but if you check your converted perl constructed .dat file to my handconstructed .dat file I am sure you will notice a lot of differences. Mine is quite messy. I was almost going to PM you for the converted .dat file but I decided to do them by hand for a number of reasons.

1. I am developing an interest in stargazing now that a good friend has purchased a very nice telescope and I thought it would be a good way to become familiar with the constellations.
2. I have discovered that Celestia works very well as an observatory when I set it up at my Lat and Long. It never occured to me just how good Celestia works as a ground based virtual goto telescope! We tried it out while viewing Saturn and were quickly able to name the viewable moons.
3. Since I did not know how to use a perl script I figured I was not alone and others might appreciate being able to simply d/l the dat file.
4. By posting some images it would allow those not familiar with asterisms to see how good they are.

There is an argument that some of the asterisms are difficult to see due to the use of faint stars. This might be true for some constellations but I think the ease of remembering the patterns while in the field far outweighs the fact that some of the stars may not be visible. If in Celestia you set the magnitude limit to five then I would say that most of the patterns can be seen.

Thanks for reply and please check PM.

Posted: 11.02.2004, 09:50
by t00fri
Wizard wrote:Hi t00fri,

I would be very interested in having a look at the alternative asterisms. I did a search for Rey's asterisms prior to constructing them and did note you had developed a perl script. My problem was I had, and still have, no idea how to use a perl script :) I was almost going to PM you for the converted .dat file but I decided to do them by hand for a number of reasons.

1. I am developing an interest in stargazing now that a good friend has purchased a very nice telescope and I thought it would be a good way to become familiar with the constellations.
2. I have discovered that Celestia works very well as an observatory when I set it up at my Lat and Long. It never occured to me just how good Celestia works as a ground based virtual goto telescope! We tried it out while viewing Saturn and were quickly able to name the viewable moons.
3. Since I did not know how to use a perl script I figured I was not alone and others might appreciate being able to simply d/l the dat file.
4. By posting some images it would allow those not familiar with asterisms to see how good they are.

There is an argument that some of the asterisms are difficult to see due to the use of faint stars. This might be true for some constellations but I think the ease of remembering the patterns while in the field far outweighs the fact that some of the stars may not be visible. If in Celestia you set the magnitude limit to five then I would say that most of the patterns can be seen.

Thanks for reply and please check PM.


Writing Perl scripts requires some practice but /applying/ Perl scripts is trivial. Perl can be easily installed in Windows, too. In Linux/Unix, it is natively implemented anyway.

Tonight I shall post all the asterism dat files that I have generated two years ago (including the one from Rey's book) in my TextureFoundy site for download. These files represent straight Perl translations from the above Skymap Pro WEB site into Celestia format.

The configurations file that I made for the Celestia distribution involves a lot of additional tuning hand work. Since I happen to be an active amateur astronomer since childhood and was associated with XEphem development for about 12 years, I also bring some respective "first hand" experience along;-)...


Bye Fridger

Posted: 11.02.2004, 10:03
by Wizard
It is always good style/fair to cite the 'maker' of such things...


You mean H.A.Rey right? Not only did I cite his name, I cited the book I got the patterns from. It took me about 2 weeks to create that file!

:)

Posted: 11.02.2004, 13:16
by t00fri
Wizard wrote:
It is always good style/fair to cite the 'maker' of such things...

You mean H.A.Rey right? Not only did I cite his name, I cited the book I got the patterns from. It took me about 2 weeks to create that file!

:)


No I did not mean Rey, since you indeed cited him correctly and most explicitly. From comparing the exact layout/format (number of entries, line breaks, spaces,...) of your Gemini constellation entries with what my asterism.pl generates, I had (presumably incorrectly) suspected that your file was produced with my Perl script. My script also produces a "boiler plate" with the appropriate citation entries (Skymap Pro, the original author(s), myself etc) which is hard to overlook...

But meanwhile, I suppose you have at most copied the Gemini entry from some other file generated by asterism.pl. That is perfectly fine without citation. Tonight, I may have a look into my asterism.pl version of the Rey constellations. I am sure the format will look quite different from yours.

After all, you worked on it for 2 weeks and me for only 1 second;-).

Bye Fridger

Posted: 11.02.2004, 20:36
by Wizard
But meanwhile, I suppose you have at most copied the Gemini entry from some other file generated by asterism.pl


The Gemini entry is the same because the default Celestia asterism.dat file, as I stated in my first post, already uses the Rey asterism. There was no need for me to convert the Gemini entry of the original asterism.dat file. To create the new asterisms I used a text editor, the original asterism.dat file and Rey's book.

Posted: 11.02.2004, 21:48
by t00fri
Wizard wrote:
But meanwhile, I suppose you have at most copied the Gemini entry from some other file generated by asterism.pl

The Gemini entry is the same because the default Celestia asterism.dat file, as I stated in my first post, already uses the Rey asterism. There was no need for me to convert the Gemini entry of the original asterism.dat file. To create the new asterisms I used a text editor, the original asterism.dat file and Rey's book.


Wizard,

yes, that matches what I said: you copied Gemini from a file that was generated by asterism.pl, which is perfectly fine, of course: The asterisms.dat file of the Celestia distribution was also generated by means of 'asterism.pl';-)...

As promised, I have uploaded a number of asterism files to the TextureFoundry. All files have been produced from the Skymap Pro files by means of my Perl script 'asterism.pl'. My script may be downloaded from here:

http://www.shatters.net/~t00fri/asterism.pl

Here are a few asterism files for playing that lurk around on my HD since two years:

http://www.shatters.net/~t00fri/asterisms-rey.dat
http://www.shatters.net/~t00fri/asterisms-karkoschka.dat
http://www.shatters.net/~t00fri/asterisms-rukl.dat
http://www.shatters.net/~t00fri/asterisms-skywatch.dat

Just rename them to asterisms.dat and place them into the Celestia/data directory.

Please note that the *.dat files are straight Perl translations into Celestia format from the files available for download on the Skymap Pro site referred to above.

My favoured asterisms are still the ones I did for the Celestia distribution!

Bye Fridger