Function planetaryHourAt

planetaryHourAt(
    observer: Observer,
    at: DateInput,
    options?: SkyDayOptions,
): { day: PlanetaryDay; hour: PlanetaryHour | null }
The planetary hour running at at, with its day: the day whose sunrise is the last at or before at. hour is null when that day is not complete.
Parameters
- observer: Observer
- at: DateInput
- Optionaloptions: SkyDayOptions
Returns { day: PlanetaryDay; hour: PlanetaryHour | null }