The profection year of an age, dated, with its months. Year n runs from the
n-th solar return (the apparent Sun back on its natal longitude; the birth
for n = 0) to the next, on the engine's ephemeris from the chart's birth as
a UTC instant on the engine's time basis, not on a chart's pinned ΔT. The default point, the Ascendant, needs a birth time and
place. Invalid ages, options and points throw RangeError. Frozen.
The profection year of an age, dated, with its months. Year n runs from the n-th solar return (the apparent Sun back on its natal longitude; the birth for n = 0) to the next, on the engine's ephemeris from the chart's birth as a UTC instant on the engine's time basis, not on a chart's pinned ΔT. The default point, the Ascendant, needs a birth time and place. Invalid ages, options and points throw RangeError. Frozen.