samuch
A method for calculating samuch lemincha ketana, / near mincha ketana time that is half an hour before minchaGedola16Point1Degrees or 9 * shaos zmaniyos (temporal hours) after the start of the day, calculated using a day starting and ending 16.1 below the horizon. This is the time that eating or other activity can't begin prior to praying mincha. The calculation used is 9 * shaahZmanis16Point1Degrees after alos 16.1˚. See the Mechaber and Mishna Berurah 232.
Return
the Date of the time of samuch lemincha ketana. If the calculation can't be computed such as northern and southern locations even south of the Arctic Circle and north of the Antarctic Circle where the sun may not reach low enough below the horizon for this calculation, a null will be returned. See detailed explanation on top of the AstronomicalCalendar documentation.