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Distance measurement is not correct #31

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pmulholland42 opened this issue Dec 31, 2020 · 1 comment
Open

Distance measurement is not correct #31

pmulholland42 opened this issue Dec 31, 2020 · 1 comment
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accuracy Accuracy of the model bug Something isn't working

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@pmulholland42
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  1. Set the time to July 4, 2020, 7:34 a.m. EDT
  2. Select Earth and view the distance from sun stat

Expected result: 152,095,295 km (https://www.space.com/41093-earth-at-aphelion-guide.html)
Actual result: higher than that

Possible explanations:

  1. The diameter of the sun and earth need to be subtracted - I tried that and the number was too low
  2. The website is wrong - need to check their source
  3. Inclination needs to be accounted for - Earth's inclination is defined as near 0 though so that shouldn't make that big of a difference. Also I'm not sure if it makes a difference at all when measuring the Earth Sun distance
  4. Something else is wrong - possibly related to Orbital motion may be inaccurate #25
@pmulholland42 pmulholland42 added bug Something isn't working accuracy Accuracy of the model labels Dec 31, 2020
@pmulholland42 pmulholland42 self-assigned this Dec 31, 2020
@pmulholland42
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pmulholland42 commented Jan 2, 2021

This is probably because the JPL data is for the Earth-Moon barycenter and not Earth itself. I could account for this but I think the better solution will be to use JPL planetary ephemerides for everything instead. I'm considering this outside the scope of the initial release.

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Labels
accuracy Accuracy of the model bug Something isn't working
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