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
2460635.5
0.270138888889
-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 Nov 21 [Thursday] Gregorian JD Number = 2460636 JD00 = 2460635.5 = JD for 00h of date Local Time = 06:29:00 = 0.270138888889 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) = 2460635.978472222222 Longitude = -76° 49' 23.915" = -76.8233097222° (W) = -05h 07m 17.594s = -5.1215539815 h ================================================================= Local Mean Sidereal Time at Longitude -76.8233097222° (W) 10h 25m 32.717s = 10.4257547191 h 156° 23' 10.76" = 156.3863207870° Local True Sidereal Time at Longitude = -76.8233097222° (W) 10h 25m 32.597s = 10.4257212828 h 156° 23' 08.95" = 156.3858192416° Greenwich Mean Sidereal Time 15h 32m 50.311s = 15.5473087006 h 233° 12' 34.670" = 233.2096305094° Greenwich True Sidereal Time 15h 32m 50.191s = 15.5472752643 h 233° 12' 32.864" = 233.2091289639° ================================================================= Applied Auxiliary Computations Time Factors Corresponding to Full Astronomical JD T = 0.248897425659 Julian centuries reckoned from J2000.0 t = 0.024889742565 Julian millennia reckoned from J2000.0 Nutations (IAU 2000B Series) -1.968" = -0.0005466510° = Nutation in ecliptical longitude +8.798" = +0.0024437753° = Nutation in ecliptical obliquity -0.120s = -0.0005015455° = Equation of the equinoxes Mean Obliquity of the Ecliptic 23° 26' 09.797" = 23.4360548075° True Obliquity of the Ecliptic 23° 26' 18.595" = 23.4384985828°
Jay Tanner - PHP Science Labs - 2024 - 1.7