ΔT of the model alone at astronomy-engine's UT, days since 2000-01-01T12:00
on UT1 (not epoch milliseconds), with its band and the part of the model
that answered. A chart from 1972 to the end of the IERS UT1 table uses IERS
instead (iers-utc/1; docs/time.md), so its ΔT can differ from this.
RangeError for a non-finite input.
ΔT of the model alone at astronomy-engine's UT, days since 2000-01-01T12:00 on UT1 (not epoch milliseconds), with its band and the part of the model that answered. A chart from 1972 to the end of the IERS UT1 table uses IERS instead (
iers-utc/1; docs/time.md), so its ΔT can differ from this. RangeError for a non-finite input.