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
2459272.5
0.000000000000
+0.208333333333
+0.000000000000
Calendar Mode:
Julian
Gregorian
Longitude:
±
D M S (Neg=W)
-76.8233055556
Optional ΔT estimate = +72 = +00h 01m 12s
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 = 20210227 = 2021 Feb 27 [Saturday] Gregorian JD00 = 2459272.5 = 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 = 2459272.708333333333 = (JD00 + LTFrac + TZFrac + dTFrac) Date/Time TT Corresponding to Full JD 20210227 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) 10h 21m 44s = 10.3621797630 h 155° 25' 58" = 155.4326964449° Local True Sidereal Time at Longitude = -76.8233055556° (W) 10h 21m 43s = 10.3619177193 h 155° 25' 44" = 155.4287657897° Greenwich Mean Sidereal Time at Longitude 0.0° 15h 29m 01.440s = 15.4837334667 h 232° 15' 21.607" = 232.2560020005° Greenwich True Sidereal Time at Longitude 0.0° 15h 29m 00.497s = 15.4834714230 h 232° 15' 07.457" = 232.2520713453° ================================================================= Applied Auxiliary Computations Time Factors Corresponding to Full Astronomical JD T = 0.211573123431 Julian centuries reckoned from J2000.0 t = 0.021157312343 Julian millennia reckoned from J2000.0 Nutations (IAU 2000B Series) -15.423" = -0.0042841129 = Nutation in ecliptical longitude +2.824" = +0.0007845234 = Nutation in ecliptical obliquity -0.943s = -0.0039306552 = Equation of the equinoxes Mean Obliquity of the Ecliptic 23° 26' 11.544" = 23.4365401173 True Obliquity of the Ecliptic 23° 26' 14.369" = 23.4373246406
Jay Tanner - PHP Science Labs - 2021 - 1.0