Wierd...

The place to discuss creating, porting and modifying Celestia's source code.
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Rassilon
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Wierd...

Post #1by Rassilon » 17.04.2002, 06:42

Check out the earths orbit beyond the 600th century...

http://cybermindtraveller.freewebspace.com/pics/earth_orbit.jpg

And when you get too far...the number goes negitive...I suspect because it passes the allocation allowed for the assigned variable...lol and earth ends up ~700000 ly from the sun :mrgreen:

i.e. integers are in a range of -32767 to 32767...
I'm trying to teach the cavemen how to play scrabble, its uphill work. The only word they know is Uhh and they dont know how to spell it!
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cweisbrod

RE: Weird

Post #2by cweisbrod » 20.04.2002, 23:45

The orbits are incorrect for extreme dates because the orbital computations use a finite number of periodic terms. In general, it is mathematically impossible to know the position of any planets for extreme dates. The computations are optimized to provide very good accuracy for a finite period of time. But ultimately, they blow up miserably.
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Buzz
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Post #3by Buzz » 22.04.2002, 10:02

We'll have interesting seasonal variations!
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Sum0
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Post #4by Sum0 » 22.04.2002, 17:25

I noticed that Earth gets very close to the sun in Celestia's future... so I went there and zoomed into the surface. Then I rotated the camera round to see the sky... and nearly fell out of my chair! The sun filled half the sky...
"I have been asked, 'Pray, Mr. Babbage, if you put into the machine wrong figures, will the right answers come out?' I am not able to rightly apprehend the kind of confusion of ideas that could provoke such a question."
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Topic author
Rassilon
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Post #5by Rassilon » 23.04.2002, 00:12

Sum0 wrote:I noticed that Earth gets very close to the sun in Celestia's future... so I went there and zoomed into the surface. Then I rotated the camera round to see the sky... and nearly fell out of my chair! The sun filled half the sky...


You should tweak the files...move the earth around Barnards Star to get a glipse of what it would look a billion years or so from now...

Of course the earth would be stripped of its atmosphere and look quite hellish in theroy ;)
I'm trying to teach the cavemen how to play scrabble, its uphill work. The only word they know is Uhh and they dont know how to spell it!
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