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
`2460485.5` ` 0.233576388889 ` ` -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 Jun 24 [Monday] Gregorian JD Number = 2460486 JD00 = 2460485.5 = JD for 00h of date Local Time = 05:36:21 = 0.233576388889 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) = 2460485.941909722222 Longitude = -76° 49' 23.915" = -76.8233097222° (W) = -05h 07m 17.594s = -5.1215539815 h ================================================================= Local Mean Sidereal Time at Longitude -76.8233097222° (W) 23h 41m 21.763s = 23.6893784870 h 355° 20' 26.44" = 355.3406773051° Local True Sidereal Time at Longitude = -76.8233097222° (W) 23h 41m 21.580s = 23.6893277416 h 355° 20' 23.70" = 355.3399161242° Greenwich Mean Sidereal Time 04h 48m 39.357s = 4.8109324685 h 72° 09' 50.353" = 72.1639870275° Greenwich True Sidereal Time 04h 48m 39.174s = 4.8108817231 h 72° 09' 47.613" = 72.1632258466° ================================================================= Applied Auxiliary Computations Time Factors Corresponding to Full Astronomical JD T = 0.244789648452 Julian centuries reckoned from J2000.0 t = 0.024478964845 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) -2.987" = -0.0008296357° = Nutation in ecliptical longitude +8.327" = +0.0023129463° = Nutation in ecliptical obliquity -0.183s = -0.0007611809° = Equation of the equinoxes Mean Ecliptic Obliquity 23° 26' 09.990" = 23.4361082189° Nutation in Obliquity +8.327" = +0.0023129463° True Ecliptic Obliquity 23° 26' 18.316" = 23.4384211652° Jay Tanner - PHP Science Labs - 2024 - 1.7