When is צאת הכוכבים in the NY/NJ area?
A. When is Shabbat over?
B. When is Yom Tov over? (Is there room for leniency on Yom Tov Sheni which is DeRabanan?)
C. When is Yom Kippur over?
D. When is Tisha B’Av and the other fasts over?
E. When can you say Kriat Shema and Sefirat Haomer?
F. When can you read the Megillah on the night of Purim?