Timeline for Find position of orbiting body along orbit efficiently
Current License: CC BY-SA 4.0
12 events
| when toggle format | what | by | license | comment | |
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| May 9, 2023 at 9:34 | comment | added | Sten | See also "How to get true anomaly from time?" | |
| May 9, 2023 at 8:41 | comment | added | w94n9 | @PM 2Ring thank you for the python code demo! I think it'll really help accelerate implementing this core mechanic :) | |
| May 9, 2023 at 8:41 | comment | added | w94n9 | @Greg Miller @ James K - Yes, it looks like Keplers equation should help with this :| I was glancingly concerned that it would require too many iterations and I have to run the final game on a mobile phone, but I think it might work out...I'm obviously not familiar with this subject deeply (and I get spun around easily) but I very much appreciate the direction you guys pointed me in! I'll bang away at that and see if I can get it to work :) | |
| May 8, 2023 at 20:49 | comment | added | James K | When you say that you know the "true anomaly" Does this mean you know the anomaly at a given (and fixed) time $t_0$ and you want help to find the anomaly at some other time $t$ ? This is the classic "solve kepler's equation" problem. | |
| May 8, 2023 at 19:55 | history | edited | PM 2Ring | CC BY-SA 4.0 |
Fixed broken URL
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| May 8, 2023 at 18:05 | comment | added | PM 2Ring | sagecell.sagemath.org/… | |
| May 8, 2023 at 18:04 | comment | added | PM 2Ring | You can easily invert Kepler's equation using Newton's method. It converges quickly, unless the eccentricity is very close to 1. Here's a short demo in Python. | |
| May 8, 2023 at 15:26 | comment | added | stretch | You're describing a software problem, not an orbital mechanics problem, and you seem to be overestimating the complexity. Your "bazillion" is less than 9 million which is a small number these days. Worst case you could precalculate millions of positions versus time and store them then just do a lookup. Can't imagine a game where time increments from seconds to hundreds of days would matter. | |
| May 8, 2023 at 14:32 | comment | added | Greg Miller | At the risk of stating the (hopefully) obvious: have you tried solving using Kepler's equation? If so, why did that not work? | |
| May 8, 2023 at 12:09 | history | edited | w94n9 | CC BY-SA 4.0 |
added 1 character in body
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| S May 8, 2023 at 12:08 | review | First questions | |||
| May 8, 2023 at 20:49 | |||||
| S May 8, 2023 at 12:08 | history | asked | w94n9 | CC BY-SA 4.0 |