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
2460435.5
0.003831018519
-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 May 05 [Sunday] Gregorian JD Number = 2460436 JD00 = 2460435.5 = JD for 00h of date Local Time = 00:05:31 = 0.003831018519 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) = 2460435.712164351852 Longitude = -76° 49' 23.915" = -76.8233097222° (W) = -05h 07m 17.594s = -5.1215539815 h ================================================================= Local Mean Sidereal Time at Longitude -76.8233097222° (W) 14h 52m 29.647s = 14.8749018326 h 223° 07' 24.70" = 223.1235274896° Local True Sidereal Time at Longitude = -76.8233097222° (W) 14h 52m 29.320s = 14.8748109800 h 223° 07' 19.79" = 223.1221646993° Greenwich Mean Sidereal Time 19h 59m 47.241s = 19.9964558141 h 299° 56' 48.614" = 299.9468372120° Greenwich True Sidereal Time 19h 59m 46.914s = 19.9963649614 h 299° 56' 43.708" = 299.9454744216° ================================================================= Applied Auxiliary Computations Time Factors Corresponding to Full Astronomical JD T = 0.243414432973 Julian centuries reckoned from J2000.0 t = 0.024341443297 Julian millennia reckoned from J2000.0 Nutations (IAU 2000B Series) -5.347" = -0.0014853515° = Nutation in ecliptical longitude +8.964" = +0.0024899212° = Nutation in ecliptical obliquity -0.327s = -0.0013627903° = Equation of the equinoxes Mean Obliquity of the Ecliptic 23° 26' 10.054" = 23.4361261001° True Obliquity of the Ecliptic 23° 26' 19.018" = 23.4386160213°
Jay Tanner - PHP Science Labs - 2024 - 1.7