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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