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
2458712.5
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 = 20190817 = 2019 Aug 17 [Saturday] Gregorian JD00 = 2458712.5 = 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 = 2458712.708333333333 = (JD00 + LTFrac + TZFrac + dTFrac) Date/Time TT Corresponding to Full JD 20190817 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) 21h 33m 53s = 21.5646779265 h 323° 28' 13" = 323.4701688969° Local True Sidereal Time at Longitude = -76.8233055556° (W) 21h 33m 52s = 21.5644157240 h 323° 27' 58" = 323.4662358605° Greenwich Mean Sidereal Time at Longitude 0.0° 02h 41m 10.434s = 2.6862316302 h 40° 17' 36.508" = 40.2934744526° Greenwich True Sidereal Time at Longitude 0.0° 02h 41m 09.490s = 2.6859694277 h 40° 17' 22.349" = 40.2895414161° ================================================================= Applied Auxiliary Computations Time Factors Corresponding to Full Astronomical JD T = 0.196241159023 Julian centuries reckoned from J2000.0 t = 0.019624115902 Julian millennia reckoned from J2000.0 Nutations (IAU 2000B Series) -15.432" = -0.0042866700 = Nutation in ecliptical longitude -2.136" = -0.0005933021 = Nutation in ecliptical obliquity -0.944s = -0.0039330364 = Equation of the equinoxes Mean Obliquity of the Ecliptic 23° 26' 12.262" = 23.4367394716 True Obliquity of the Ecliptic 23° 26' 10.126" = 23.4361461695
Jay Tanner - PHP Science Labs - 2019 - 1.0