Sidereal Time Calculator For Any Date, Time and Longitude
PHP Program by Jay Tanner
Local Date
±
Y M D (Neg=BC)
Local Time
HH MM SS (00 to 24h)
Local Time Zone Offset
HH MM (Neg/Pos = W/E)
ΔT (Delta T)
±
HMS
UT
2460518.5
0.381875000000
-0.208333333333
+0.000000000000
Calendar Mode:
Julian
Gregorian
Longitude:
±Deg.ddd or ±D M S (Neg=W)
-76.8233097222
IMPORTANT:
Make sure that the local time, time zone and longitude are correctly matched for the location.
Optional NASA Polynomial ΔT estimate = +74 sec = +00h 01m 14s
Double-Click Within Text Area to Select ALL Text
SIDEREAL TIME FOR GIVEN DATE, TIME AND LONGITUDE Local Date = 2024 Jul 27 [Saturday] Gregorian JD Number = 2460519 JD00 = 2460518.5 = JD for 00h of date Local Time = 09:09:54 = 0.381875000000 day T Zone Diff = -05:00 = -0.208333333333 day Delta T = +00:00:00 = +0.000000000000 day Astronomical Julian Date: JDTT = JDNum - 0.5 + LTFrac - (TZFrac) + (dTFrac) = 2460519.090208333333 Longitude = -76° 49' 23.915" = -76.8233097222° (W) = -05h 07m 17.594s = -5.1215539815 h ================================================================= Local Mean Sidereal Time at Longitude -76.8233097222° (W) 05h 25m 36.171s = 5.4267140536 h 81° 24' 02.56" = 81.4007108044° Local True Sidereal Time at Longitude = -76.8233097222° (W) 05h 25m 36.054s = 5.4266817589 h 81° 24' 00.81" = 81.4002263841° Greenwich Mean Sidereal Time 10h 32m 53.765s = 10.5482680351 h 158° 13' 26.474" = 158.2240205267° Greenwich True Sidereal Time 10h 32m 53.649s = 10.5482357404 h 158° 13' 24.730" = 158.2235361065° ================================================================= Applied Auxiliary Computations Time Factors Corresponding to Full Astronomical JD T = 0.245697199406 Julian centuries reckoned from J2000.0 t = 0.024569719940 Julian millennia reckoned from J2000.0 Nutations (IAU 2000B Series) -1.901" = -0.0005279859° = Nutation in ecliptical longitude +8.865" = +0.0024626062° = Nutation in ecliptical obliquity -0.116s = -0.0004844203° = Equation of the equinoxes Mean Obliquity of the Ecliptic 23° 26' 09.947" = 23.4360964184° True Obliquity of the Ecliptic 23° 26' 18.812" = 23.4385590247°
Jay Tanner - PHP Science Labs - 2024 - 1.7