The solar arc at target: the Sun of progressedBodies(birthUtc, target) minus the natal Sun, both read as UTC instants on the engine's time basis (never on a chart's pinned ΔT). Invalid instants throw RangeError. Frozen.
target
progressedBodies(birthUtc, target)
The solar arc at
target: the Sun ofprogressedBodies(birthUtc, target)minus the natal Sun, both read as UTC instants on the engine's time basis (never on a chart's pinned ΔT). Invalid instants throw RangeError. Frozen.