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
2460665.5
0.570763888889
-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 Dec 21 [Saturday] Gregorian JD Number = 2460666 JD00 = 2460665.5 = JD for 00h of date Local Time = 13:41:54 = 0.570763888889 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) = 2460666.279097222222 Longitude = -76° 49' 23.915" = -76.8233097222° (W) = -05h 07m 17.594s = -5.1215539815 h ================================================================= Local Mean Sidereal Time at Longitude -76.8233097222° (W) 19h 37m 54.493s = 19.6318034820 h 294° 28' 37.39" = 294.4770522299° Local True Sidereal Time at Longitude = -76.8233097222° (W) 19h 37m 54.466s = 19.6317960461 h 294° 28' 36.99" = 294.4769406915° Greenwich Mean Sidereal Time 00h 45m 12.087s = 0.7533574635 h 11° 18' 01.303" = 11.3003619523° Greenwich True Sidereal Time 00h 45m 12.060s = 0.7533500276 h 11° 18' 00.901" = 11.3002504138° ================================================================= Applied Auxiliary Computations Time Factors Corresponding to Full Astronomical JD T = 0.249727011559 Julian centuries reckoned from J2000.0 t = 0.024972701155 Julian millennia reckoned from J2000.0 Nutations (IAU 2000B Series) -0.438" = -0.0001215694° = Nutation in ecliptical longitude +8.640" = +0.0023998687° = Nutation in ecliptical obliquity -0.027s = -0.0001115385° = Equation of the equinoxes Mean Obliquity of the Ecliptic 23° 26' 09.758" = 23.4360440208° True Obliquity of the Ecliptic 23° 26' 18.398" = 23.4384438895°
Jay Tanner - PHP Science Labs - 2024 - 1.7