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
2460641.5
0.077511574074
-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 27 [Wednesday] Gregorian JD Number = 2460642 JD00 = 2460641.5 = JD for 00h of date Local Time = 01:51:37 = 0.077511574074 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) = 2460641.785844907407 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 11m 03.482s = 6.1843006132 h 92° 45' 52.23" = 92.7645091983° Local True Sidereal Time at Longitude = -76.8233097222° (W) 06h 11m 03.347s = 6.1842630096 h 92° 45' 50.20" = 92.7639451438° Greenwich Mean Sidereal Time 11h 18m 21.077s = 11.3058545947 h 169° 35' 16.148" = 169.5878189206° Greenwich True Sidereal Time 11h 18m 20.941s = 11.3058169911 h 169° 35' 14.118" = 169.5872548661° ================================================================= Applied Auxiliary Computations Time Factors Corresponding to Full Astronomical JD T = 0.249056422858 Julian centuries reckoned from J2000.0 t = 0.024905642285 Julian millennia reckoned from J2000.0 Circular Trig Functions of Given Longitude Longitude = -76.8233097222° (W) sin(Lon) = -0.973671722605411 cos(Lon) = +0.227954768756023 tan(Lon) = -4.271337370649689 Nutations (IAU 2000B Series) -2.213" = -0.0006147816° = Nutation in ecliptical longitude +8.807" = +0.0024463782° = Nutation in ecliptical obliquity -0.135s = -0.0005640545° = Equation of the equinoxes Mean Ecliptic Obliquity 23° 26' 09.790" = 23.4360527401° Nutation in Obliquity +8.807" = +0.0024463782° True Ecliptic Obliquity 23° 26' 18.597" = 23.4384991183°
Jay Tanner - PHP Science Labs - 2024 - 1.7