Zmanim
MGA · Gra where they differMinyanim
Learning Sedarim
How zmanim are calculated
Alos is 16.1° below the horizon. The Magen Avraham's day runs from alos to tzeis at 16.1°; the Gra's from sunrise to sunset. Deadlines such as Sof zman Shema and shkia are rounded down to the minute, start times are rounded up. Tzeis is 8.5°. Candle lighting is 18 minutes before shkia. Times are for sea level at 565 Broadway. Please ask the Rav with any shaila.