We all love watching sunset, but when exactly is the sunset, the moment when day switches to night?

This question is very relevant in Judaism since Shabbat and Jewish holidays begin at sunset. Time is a central pillar in Judaism. Shabbat and Jewish holidays begin and end at certain times. Many commandments must be fulfilled on specific days, at specific times or during the day or night. Jewish scholars have analyzed time and debated classifying days, nights and other moments for over 3,000 years,

A discussion about Zemanim - Time in Judaism