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
2460596.5
0.836238425926
-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 Oct 13 [Sunday] Gregorian JD Number = 2460597 JD00 = 2460596.5 = JD for 00h of date Local Time = 20:04:11 = 0.836238425926 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) = 2460597.544571759259 Longitude = -76° 49' 23.915" = -76.8233097222° (W) = -05h 07m 17.594s = -5.1215539815 h ================================================================= Local Mean Sidereal Time at Longitude -76.8233097222° (W) 21h 29m 11.971s = 21.4866587442 h 322° 17' 59.57" = 322.2998811626° Local True Sidereal Time at Longitude = -76.8233097222° (W) 21h 29m 11.816s = 21.4866155814 h 322° 17' 57.24" = 322.2992337205° Greenwich Mean Sidereal Time 02h 36m 29.566s = 2.6082127257 h 39° 07' 23.487" = 39.1231908849° Greenwich True Sidereal Time 02h 36m 29.410s = 2.6081695629 h 39° 07' 21.156" = 39.1225434428° ================================================================= Applied Auxiliary Computations Time Factors Corresponding to Full Astronomical JD T = 0.247845162813 Julian centuries reckoned from J2000.0 t = 0.024784516281 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) -2.540" = -0.0007056698° = Nutation in ecliptical longitude +9.564" = +0.0026565681° = Nutation in ecliptical obliquity -0.155s = -0.0006474421° = Equation of the equinoxes Mean Ecliptic Obliquity 23° 26' 09.847" = 23.4360684895° Nutation in Obliquity +9.564" = +0.0026565681° True Ecliptic Obliquity 23° 26' 19.410" = 23.4387250577°
Jay Tanner - PHP Science Labs - 2024 - 1.7