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astronomy/source
Don Cross b6087c9b14 Pluto integrator: fixed a small math mistake.
I didn't implement the math I had derived on paper exactly right.
There was one place where I meant to have (dt^3 / 6), but I had (dt^2 / 6).
This has only a tiny effect on the error. I know this can work better,
so I'm still searching for the real problem.

C PlutoCheck: 2049-12-19T12:00:00.000Z = 18250.000000 UT = 18250.001076 TT
C PlutoCheck: calc pos = [ 37.3682426267669996, -10.0216432448322834, -14.3724661626442582]
C PlutoCheck: ref  pos = [ 37.4377303529113306, -10.2466292445590774, -14.4773101309873091]
C PlutoCheck: del  pos = [ -0.0694877261443310,   0.2249859997267940,   0.1048439683430509]
C PlutoCheck: error = 2.577586e-01
2020-08-18 21:59:37 -04:00
..
2019-05-15 22:09:24 -04:00