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    \$\begingroup\$ Set k=a*(1-e*e) to be reused in r and t. Divide 10 in r to remove *0.01 in t. \$\endgroup\$ Commented Jul 19, 2024 at 5:04
  • \$\begingroup\$ @akamayu k is now being used, but p=a-a*e*e is now available for a total savings of 6 bytes \$\endgroup\$ Commented Jul 20, 2024 at 23:15
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    \$\begingroup\$ @guest4308 Explanation in 1 hour, golfing tomorrow. The change from a*(1-e*e) to (a-a*e*e) will help combine the formulas where r is calculated & used into one, eliminating need for r and the proposed k. I've introduced k for a different purpose since akamayu's comment, to record longitude of 1st point plotted. By checking k against longitude at start of each new orbit (within a margin) the iterations are stopped if the ground track starts to repeat (LCM of orbit and planet rotation period.) I've changed some variable names (including removal of p) to facilitate explanation. \$\endgroup\$ Commented Jul 20, 2024 at 23:33
  • \$\begingroup\$ @LevelRiverSt it looks to me like the -6 bytes works with your code and with your explanation; what was the problem with it? \$\endgroup\$ Commented Jul 21, 2024 at 8:30
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    \$\begingroup\$ @guest4308 combining the formulas that generate and use r into one is a bigger saving t+=d*((a-a*e*e)**3/u)**0.5/(1+e*Math.cos(v+=d))**2 . I am trying out several golf ideas and will post the golfed version in about 12 hours (as I have other things to do today) in addition to the ungolfed version. \$\endgroup\$ Commented Jul 21, 2024 at 9:02