2000413.125 is the Julian date for September 18th, 2020. Julian dates are used by astronomers, the military, and sometimes in manufacturing for various purposes. In astronomy, the Julian date is used as a reference system for observations taken at different locations and times. In particular, Julian dates are used to compute the apparent position of celestial objects. In the military, Julian dates are also used to communicate time and date information and are used in planning, scheduling and mission execution. In manufacturing, Julian dates are used to indicate the last time a particular item was inspected or serviced.
