According to those who pray Mincha only up to Shekiya (sunset), are you required to finish Mincha before Shekiya or just required to begin it before Shekiya? (Sources.)
Looking at this myzmanim.com chart for Brooklyn, NY on 01/21/2013 it gives me the following Zmanim for Mincha Gedola. 30 fixed minutes after midday 12:37:27 Gra & Baal Tanya 12:31:53 ...
Many shuls worldwide run combined weekday Mincha/Maariv services. How long before sunset do these services tend to start? Please specify a range, measured in "number of minutes". Also, please cite ...