4 ms·

I don't get how one can get realistic modeling of eclipses without taking into account the eccentricity of Earth's orbit around the Sun (it not only minorly aff

• mcphage 4y ago
  You might be able to compensate for that in the calendar track?
• skykooler 4y ago
  My intuition is that that would affect the location of the eclipse track across the earth, but that it’s not enough to significantly shift the date of the eclipse since that’s more determined by the moon’s location.
• jagthebeetle 4y ago
  Isn't the earth's eccentricity incredibly low? (To the point that human-noticeability or non-precision-machinability are out of the question?) That's not to say I have any comment on the accuracy of ellipse calculation. Keplerian mechanics are beyond me. But I did see a the gear-ratio calculation repo linked: https://github.com/amandaghassaei/tellurion-orrery/tree/main/gear-calculations https://github.com/amandaghassaei/tellurion-orrery/tree/main... It seems angular positional error after 100 years of simulation was the optimization goal.
  • robryk 4y ago
    > Isn't the earth's eccentricity incredibly low? (To the point that human-noticeability or non-precision-machinability are out of the question?) It's one-percentish, and causes the length of time between equinoxes to be shorter on the northern-hemisphere-winter-side by a day or so. The date scale on the model includes single-day divisions, which made me think that such accuracy was intended; perhaps I was wrong in that.