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

Lots of ancient civilizations had calendars. Once you’re able to figure out one of those calendar systems, you can match up events in calendars that you know with identical events in calendars that you don’t know.

This relies on pinpointing specific days. This can be done by ancient records of eclipses or other easily determined geological/astrological events. We can use science to pinpoint this exactly for thousands of years in the past. You can also use references like seasonal changes (the beginning of summer is pretty constant from year to year) as well.