The term Motza'ei Shabbat (Hebrew: מוצאי שבת—literally, the going out of the Sabbath) in Judaism refers to the time in the evening immediately following Shabbat, that is Saturday night.
This may occur no earlier than when three "small" stars appear in the sky.
[1] There are varying opinions as to how much time elapses following sunset until this occurs.
This difference of opinions results in different ways to predetermine the fixed time when the Shabbat will end on a given Saturday night.
Regardless of location, the time that Shabbat ends, which is approximately one hour later than the time for candle lighting the day before, fluctuates approximately four hours throughout the calendar year and by up to 17 minutes from one week to the next (or by more than an hour if the time has changed during the previous week).