ExperimentalReadonly ExperimentalchartIts time is known only when both births' are.
Readonly ExperimentalflagsReadonly ExperimentalinstantThe mean of the two births' UTC instants, rounded down to the millisecond.
Readonly ExperimentallocationNull unless both births have a place.
Readonly Experimentalplace
A Davison chart, with the instant and the place it was cast for.
The conventions of a Davison chart here (the place's default, the house system, a known time only when both are known) may change in a minor release.