get
A utility method that returns the time of an offset by degrees below or above the horizon of sunset. Note that the degree offset is from the vertical, so for a calculation of 14 after sunset, an offset of 14 + AstronomicalCalendar.GEOMETRIC_ZENITH = 104 would have to be passed as a parameter.
Return
The Dateof the offset after (or before) sunset. If the calculation can't be computed such as in the Arctic Circle where there is at least one day a year where the sun does not rise, and one where it does not set, a null will be returned. See detailed explanation on top of the page.
Parameters
the degrees after sunset to use in the calculation. For time before sunset use negative numbers. Note that the degree offset is from the vertical, so for a calculation of 14 after sunset, an offset of 14 + AstronomicalCalendar.GEOMETRIC_ZENITH = 104 would have to be passed as a parameter.