At what time does the night begin and when does it end?

Night or nighttime is the period of time when the sun is below the horizon
https://en.wikipedia.org/wiki/Night
but i think its counted as morning when it hits 00:00am

According to Jewish and Muslim definitions, night begins when three stars are visible in the sky, and ends at the first sign of sunlight the following morning.

Night or nighttime is the period of time when the sun is below the horizon. The opposite of night is day (or "daytime" to distinguish it from "day" as used for a 24-hour period). Time of day varies based on factors such as season, latitude, longitude and timezone.

https://en.wikipedia.org/wiki/Night



Understand also that at earth's Poles night can last as long as 6 months.