Which field of study utilizes the Julian year?

Astronomers do use exactly 365.25 days per year; however this is not the figure used on calendars; that is the Gregorian year, which as TestyAlien34433 states removes 3 days in every 400 years.

Gread, agreed. 3 out of 4 century years are NOT leap years. So it is closer to 365.24 days per year.

It is NOT exactly 365.25

What is the meaning of amsteology