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
2459341.5
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 = 20210507 = 2021 May 07 [Friday] Gregorian JD00 = 2459341.5 = 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 = 2459341.708333333333 = (JD00 + LTFrac + TZFrac + dTFrac) Date/Time TT Corresponding to Full JD 20210507 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) 14h 53m 46s = 14.8961576687 h 223° 26' 33" = 223.4423650308° Local True Sidereal Time at Longitude = -76.8233055556° (W) 14h 53m 45s = 14.8958638486 h 223° 26' 17" = 223.4379577285° Greenwich Mean Sidereal Time at Longitude 0.0° 20h 01m 03.761s = 20.0177113724 h 300° 15' 56.414" = 300.2656705864° Greenwich True Sidereal Time at Longitude 0.0° 20h 01m 02.703s = 20.0174175523 h 300° 15' 40.548" = 300.2612632841° ================================================================= Applied Auxiliary Computations Time Factors Corresponding to Full Astronomical JD T = 0.213462240474 Julian centuries reckoned from J2000.0 t = 0.021346224047 Julian millennia reckoned from J2000.0 Nutations (IAU 2000B Series) -17.293" = -0.0048036220 = Nutation in ecliptical longitude +2.950" = +0.0008194001 = Nutation in ecliptical obliquity -1.058s = -0.0044073023 = Equation of the equinoxes Mean Obliquity of the Ecliptic 23° 26' 11.456" = 23.4365155540 True Obliquity of the Ecliptic 23° 26' 14.406" = 23.4373349541
Jay Tanner - PHP Science Labs - 2021 - 1.0