(JD:Julian day) (Julian Day) 471311 ) JD JD UT1 JD UTC JD TAI JD TT MJD JDMJD MJD = JD - 2400000.5 MJD JD (Gregoriano) 4 100400 4 400 3 1582104() 15821015() 1P/- 11 Q1 - 11 Oct. 10.849 12 1P/ 66 B1 66 Jan.