Sidereal Time Calculator For Any Date, Time and Longitude
Local Date
±
YMD (Neg=BC)
Local Time
HMS (00 to 24h)
Time Zone Difference
HM (00 to ±12h)
ΔT (Delta T)
±
HMS
Local Time
= UT
2459512.5
0.000000000000
+0.208333333333
+0.000000000000
Calendar Mode:
Julian
Gregorian
Longitude:
±
D M S (Neg=W)
-76.8233055556
Optional ΔT estimate = +73 = +00h 01m 13s
This program uses a cookie to store and remember the above interface settings between calls.
SIDEREAL TIME FOR GIVEN DATE, TIME AND LONGITUDE Local Date = 20211025 = 2021 Oct 25 [Monday] Gregorian JD00 = 2459512.5 = JD number for 00h TT of date Local Time = 00:00:00 = 0.000000000000 day T Zone Diff = +05:00 = +0.208333333333 day Delta T = +00:00:00 = +0.000000000000 day Full astronomical JD number = Sum of all given date/time elements above JD = 2459512.708333333333 = (JD00 + LTFrac + TZFrac + dTFrac) Date/Time TT Corresponding to Full JD 20211025 05:00:00.0 TT Longitude = -76° 49' 23.9" = -76.8233055556° (W) = -05h 07m 17.6s = -5.1215537037 h ================================================================= Local Mean Sidereal Time at Longitude -76.8233055556° (W) 02h 07m 57s = 2.1325376967 h 31° 59' 17" = 31.9880654505° Local True Sidereal Time at Longitude = -76.8233055556° (W) 02h 07m 56s = 2.1322549381 h 31° 59' 02" = 31.9838240722° Greenwich Mean Sidereal Time at Longitude 0.0° 07h 15m 14.729s = 7.2540914004 h 108° 48' 40.936" = 108.8113710061° Greenwich True Sidereal Time at Longitude 0.0° 07h 15m 13.711s = 7.2538086419 h 108° 48' 25.667" = 108.8071296278° ================================================================= Applied Auxiliary Computations Time Factors Corresponding to Full Astronomical JD T = 0.218143965320 Julian centuries reckoned from J2000.0 t = 0.021814396532 Julian millennia reckoned from J2000.0 Nutations (IAU 2000B Series) -16.642" = -0.0046227892 = Nutation in ecliptical longitude +4.366" = +0.0012126744 = Nutation in ecliptical obliquity -1.018s = -0.0042413783 = Equation of the equinoxes Mean Obliquity of the Ecliptic 23° 26' 11.237" = 23.4364546797 True Obliquity of the Ecliptic 23° 26' 15.602" = 23.4376673541
Jay Tanner - PHP Science Labs - 2021 - 1.0