How can historians know the dates of things so specifically?

Question

Example: Historians can know when the Jewish Temple was destroyed, when certain Pharaohs reigned, when the Gallic wars occurred, etc.

In: Other

Answer 1

Because people back then recorded these events in writing. For some things that weren’t explicitly recorded, they can make an estimation based on other records. For example, the earliest recorded reference to some event, even if it doesn’t give the year of that event, at least provides a latest possible limit for that event taking place.