sofZmanKidushLevana15Days

Returns the latest time of Kiddush Levana calculated as 15 days after the molad. This is the opinion brought down in the Shulchan Aruch (Orach Chaim 426). It should be noted that some opinions hold that the Rema who brings down the the Maharil's opinion of calculating it as half way between molad and molad is of the opinion of the Mechaber as well. Also see the Aruch Hashulchan. For additional details on the subject, See Rabbi Dovid Heber's very detailed writeup in Siman Daled (chapter 4) of Shaarei Zmanim. This method returns the time even if it is during the day when Kiddush Levana can't be said. Callers of this method should consider displaying alos before this time if the zman is between alos and tzais.

See also