When I accelerate time by a lot, and the time gets far enough, the orbits go all funky, and the planets then crash into the Sun.
Is this a calculation bug, or are we really going to crash into the sun in 100000 years?
Report bugs, bug fixes and workarounds here.
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Looking at bruckner's bug report, it's clear that the calculations Celestia uses for the orbits of the major planets are unstable over thousands of years. There are a couple of possible workarounds. My least favorite is setting a minimum and maximum time . . . What I'll probably do is just use purely elliptical orbits for the planets if the time is outside a certain range.