The orbit lines kept the shape of the J2000 elements and only turned with the node, while the
markers moved on Standish's drifting a and e. Saturn's eccentricity falls 0.00032 a century, so
at AD 1 its line passed 0.056 AU (8.4 million km) from Saturn, Jupiter's 0.016 AU from Jupiter,
and Pluto's 0.021 AU from Pluto at AD 3000. The comment that said no drawn line shows the drift
weighed one century of Pluto's axis, not twenty of Saturn's eccentricity.
update() now writes the line's 129 points again once |da| + a |de| since they were drawn passes
1e-4 AU, well under the 128 chords' own sag. Measured in the app on :4301, marker to its own
polyline: Saturn 0.0016 AU at AD 1 and 0.0028 at AD 2999, Jupiter 0.0014 at AD 1, Pluto 0.0078
at AD 2999 and 0.0082 today, all the chord sag.
The existing Mars test checked only that Mars stays in its line's plane. A new test measures the
distance to the drawn chords: Saturn 0.0017 AU and Mars 0.0005 at AD 1 (0.054 and 0.0022 without
the redraw). Guarded mutants: the call removed, and the threshold raised to 1 AU, each fail it
and only it.
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
SenrokaiandClaude Opus 5.5
c2683da37b