Favorite Celestia Views (a cel://URL Repository)

All about writing scripts for Celestia in Lua and the .cel system
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selden
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Re: Favorite Celestia Views (a cel://URL Repository)

Post #81by selden » 06.02.2011, 10:40

Ben,

No, you're not doing anything wrong :( Celestia's internal coordinate system has changed since those URLs were recorded, making them invalid. Chris had originally hoped to be able to provide a backward compatibility option so older URLs would still work, but that turned out to be impossible.

Some background:

The version of Celestia that Don used (v1.4, I suspect) placed the observer at a fixed position relative to Celestia's "universal coordinate system". If you look at the distance value shown in the top left of Celestia's window, you'll see that the viewpoint is 206 AU away from the selected object. Celestia originally had its origin (the position where coordinates are [0,0,0] ) some 200 AU away from the Sun to avoid numeric problems often seen when one is working with very tiny values. Celestia's algorithms have changed since then, so that's no longer a problem. In order for Celestia to be able to work correctly with the ephemerides used by NASA, Celestia's origin is now at the Solar System's barycenter, the position in space around which the Sun and all the planets orbit. For the same reason, Celestia's internal time scale has changed.

It used to be that when Celestia drew spacecraft orbiting distant planets (like Cassini around Saturn), they'd be drawn hundreds of kilometers away from where they were supposed to be, often colliding with the moons. Now they flyby moons almost exactly where and when NASA's official publications say they should. There are some minor differences which usually can be attributed to NASA using slightly improved spacecraft orbital parameters which have not yet been published.

In addition to these coordinate system changes, the format of URLs seems likely to change, too. The URLs generated by Celestia v1.6 and later contain a version number at the end, so there's some hope that some compatibility can be maintained with future versions.
Selden

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John Van Vliet
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Re: Favorite Celestia Views (a cel://URL Repository)

Post #82by John Van Vliet » 06.02.2011, 10:51

--- edit ---
Last edited by John Van Vliet on 19.10.2013, 08:07, edited 1 time in total.

surket
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Re: Favorite Celestia Views (a cel://URL Repository)

Post #83by surket » 06.02.2011, 12:49

Thanks John. You are quite right -- the last few views and also your Mars view worked fine on my Mac. I am glad that Selden added a note to the start of the post to alert the newcomers like me.

I have put in a feature request in an earlier post to convert URLs to a script file (.cel or .celx). It would be far easier to review and edit a script file than trying to make sense of the inscrutable URLs.

Thanks again for keeping me motivated with your expert comments.

Ben

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jogad
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Re: Favorite Celestia Views (a cel://URL Repository)

Post #84by jogad » 06.02.2011, 19:37

Selden wrote:[ Sadly, Celestia's internal coordinate system has changed since Don recorded these URLs. When used by Celestia v1.6.0 or later, URLs recorded by Celestia v1.4 place the viewpoint more than 200AU from the desired position. ...Selden ]

john Van Vliet wrote:the old cel:???????? will NOT work

This is why some times ago, I translated a large part of the cel:urls of this thread here:
viewtopic.php?f=2&t=13305&p=110952

But it was for celestia 1.51 the (cel:urls version 2) :(

Some of them (but not all) work fine also in celestia 1.6.
:arrow: I'm going to take them again and convert to version 3 (celestia 1.6) in the next post..

Actually I don't consider that the right place for the cel:url is in the scripting forum :?: :?: :?:
Last edited by jogad on 06.02.2011, 19:51, edited 1 time in total.

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jogad
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Re: Favorite Celestia Views (a cel://URL Repository)

Post #85by jogad » 06.02.2011, 19:42

 
Old CEL:URLs converted for celestia 1.6

By don
Constelations rotating around the North Pole
Hubble space telescope
"Chase" the Moon with the Earth in view and time sped up
Chasing the ISS

Moon orbiting Earth (starting from the lower right corner)
Follow Earth with Orbits displayed (Sun orbits Earth)
Using the Ecliptical Coordinate System on our sun (Sol), allows you to watch the planets orbit the sun
Lock Earth-Moon showing Moon Phases. Earth is the reference object and Moon is the target object
Another example using Earth as the reference object, but Sol as the target
Chase Moon, with Earth in view

ISS rotating over Sol
Sol rise from ISS
Toutatis (2004-09-2 - ~1.360.000 km for Earth

OCCULTATIONS:
Venus on Jupiter
Mars on Neptune
Venus on Neptune
Mars on Uranus
Mercure on Uranus
Venus on Saturn
Jupiter with Europa on Neptune
Full Solar System view
norm.shaw -- Moon set following the Earth

By Rich : Skylab shot

By Don
Very close view of Thebe on Jupiter
Halley
Saturn Sunrise (track sol, sychro saturn)

by Harry
Mercury double sunrise

transits and occultations by don (accelerate to see motion)
9 BC Mars Transits Saturn
1613 Jupiter Occults Neptune
1818 Venus Transits Jupiter
2003 Transit of Mercury
2012 Transit of Venus
Future Transit of Mars
2065 Venus Occults Ganymede
2065 Venus Transits Jupiter
1984 Earth Transit from Mars
2020 Jupiter and Saturn about 1.5 arcminutes apart
1972 Moon Occults the Pleiades

by backman
Eagle Nebula viewed from Mars (this CEL requires the EAGLE NEBULA ADDON)
Good morning from Phobos!
Phobos orbiting Mars (better if you?ve got a fine Mars texture -8k or 16k, for example-)

by don. Saturn?s valls (from Titan surface)

By backman
Mir and Moon
Earth passing through M16 (requires M16 addon)
Solar eclipse in 2005
Moon is smaller than South America

posted by Psykotic. Triple transit of Jupiter's Moons in March of 2004.

By Terrier
For these links you must download the following addons. But believe me, it is worthwhile!
http://www.celestiamotherlode.net/creat ... r-full.zip
http://www.celestiamotherlode.net/creat ... r-full.zip
http://celestiamotherlode.net/creators/ ... d_CMOD.zip

The 1979 fly-by of Saturn by Pioneer 11
Voyager 1
Voyager 2
Cassini


By VBSmiles: 1998 KY26 With Borrelly

Pleiades by Juan Marino

by Hoover : To see this one all you have to do is live a long time and hitch a ride on a ship to Neptune.

TechnoPhil
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Re: Favorite Celestia Views (a cel://URL Repository)

Post #86by TechnoPhil » 05.09.2011, 06:07

Hy guys!
I am looking for other cel://URL!
Can you help me?

Filippo

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Marco Klunder
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Re: Favorite Celestia Views (a cel://URL Repository)

Post #87by Marco Klunder » 05.09.2011, 22:08

TechnoPhil wrote:I am looking for other cel://URL!

Can you please further explain your question?
Marco Klunder
email: marco.klunder@hccnet.nl
Windows7 Ultimate, PD 3.0 GHz, 2 GB of RAM, Nvidia GeForce 6700 XL
Celestia161 / SVN + Lua Edu Tools v1.2 Beta9 and Celestia160-ED

TechnoPhil
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Re: Favorite Celestia Views (a cel://URL Repository)

Post #88by TechnoPhil » 06.09.2011, 05:47

"jogad" in his post published a list of cel://URL.
I'm looking for more URL, that's all!
For example here i found other Celestia's links: http://www.celestia4all.com/gallery.htm

I would like to find Celestia's links because with links is much easier to see the objects and planets, and also i don't need to search them in Celestia's universe!

I am sorry for my bad english, forgive me! :mrgreen:

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John Van Vliet
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Re: Favorite Celestia Views (a cel://URL Repository)

Post #89by John Van Vliet » 08.09.2011, 08:42

--- edit ---
Last edited by John Van Vliet on 19.10.2013, 06:44, edited 1 time in total.

TechnoPhil
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Re: Favorite Celestia Views (a cel://URL Repository)

Post #90by TechnoPhil » 08.09.2011, 08:59

@ john Van Vliet

Thank you very much!
I will study carefully it as soon as possible! :wink:


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