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
2458599.5  0.000000000000   +0.208333333333   +0.000000000000
Calendar Mode:    Julian             Gregorian

Longitude:  ±D M S (Neg=W)
-76.8233055556

Optional ΔT estimate = +71 = +00h 01m 11s
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 = 20190426 = 2019 Apr 26 [Friday] Gregorian JD00 = 2458599.5 = 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 = 2458599.708333333333 = (JD00 + LTFrac + TZFrac + dTFrac) Date/Time TT Corresponding to Full JD 20190426 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 08m 22s = 14.1394677360 h 212° 05' 31" = 212.0920160394° Local True Sidereal Time at Longitude = -76.8233055556° (W) 14h 08m 21s = 14.1391776359 h 212° 05' 16" = 212.0876645387° Greenwich Mean Sidereal Time at Longitude 0.0° 19h 15m 39.677s = 19.2610214397 h 288° 54' 55.158" = 288.9153215950° Greenwich True Sidereal Time at Longitude 0.0° 19h 15m 38.633s = 19.2607313396 h 288° 54' 39.492" = 288.9109700943° ================================================================= Applied Auxiliary Computations Time Factors Corresponding to Full Astronomical JD T = 0.193147387634 Julian centuries reckoned from J2000.0 t = 0.019314738763 Julian millennia reckoned from J2000.0 Nutations (IAU 2000B Series) -17.074" = -0.0047427510 = Nutation in ecliptical longitude -3.181" = -0.0008834908 = Nutation in ecliptical obliquity -1.044s = -0.0043515008 = Equation of the equinoxes Mean Obliquity of the Ecliptic 23° 26' 12.407" = 23.4367796985 True Obliquity of the Ecliptic 23° 26' 09.226" = 23.4358962077 Jay Tanner - PHP Science Labs - 2019 - 1.0