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
2459916.5
0.056562500000
-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 = +73 sec = +00h 01m 13s
Double-Click Within Text Area to Select ALL Text
SIDEREAL TIME FOR GIVEN DATE, TIME AND LONGITUDE Local Date = 2022 Dec 03 [Saturday] Gregorian JD Number = 2459917 JD00 = 2459916.5 = JD for 00h of date Local Time = 01:21:27 = 0.056562500000 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) = 2459916.764895833333 Longitude = -76° 49' 23.915" = -76.8233097222° (W) = -05h 07m 17.594s = -5.1215539815 h ================================================================= Local Mean Sidereal Time at Longitude -76.8233097222° (W) 06h 02m 25.884s = 6.0405233261 h 90° 36' 28.26" = 90.6078498908° Local True Sidereal Time at Longitude = -76.8233097222° (W) 06h 02m 25.140s = 6.0403167897 h 90° 36' 17.11" = 90.6047518456° Greenwich Mean Sidereal Time 11h 09m 43.478s = 11.1620773075 h 167° 25' 52.175" = 167.4311596132° Greenwich True Sidereal Time 11h 09m 42.735s = 11.1618707712 h 167° 25' 41.022" = 167.4280615680° ================================================================= Applied Auxiliary Computations Time Factors Corresponding to Full Astronomical JD T = 0.229206431097 Julian centuries reckoned from J2000.0 t = 0.022920643109 Julian millennia reckoned from J2000.0 Nutations (IAU 2000B Series) -12.156" = -0.0033766522° = Nutation in ecliptical longitude +6.521" = +0.0018113281° = Nutation in ecliptical obliquity -0.744s = -0.0030980452° = Equation of the equinoxes Mean Obliquity of the Ecliptic 23° 26' 10.719" = 23.4363108398° True Obliquity of the Ecliptic 23° 26' 17.240" = 23.4381221679°
Jay Tanner - PHP Science Labs - 2022 - 1.7