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
`2460460.5` ` 0.755613425926 ` ` -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 30 [Thursday] Gregorian JD Number = 2460461 JD00 = 2460460.5 = JD for 00h of date Local Time = 18:08:05 = 0.755613425926 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) = 2460461.463946759259 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 36m 35.369s = 10.6098247225 h 159° 08' 50.53" = 159.1473708372° Local True Sidereal Time at Longitude = -76.8233097222° (W) 10h 36m 35.103s = 10.6097507272 h 159° 08' 46.54" = 159.1462609078° Greenwich Mean Sidereal Time 15h 43m 52.963s = 15.7313787040 h 235° 58' 14.450" = 235.9706805595° Greenwich True Sidereal Time 15h 43m 52.697s = 15.7313047087 h 235° 58' 10.454" = 235.9695706301° ================================================================= Applied Auxiliary Computations Time Factors Corresponding to Full Astronomical JD T = 0.244119478350 Julian centuries reckoned from J2000.0 t = 0.024411947835 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) -4.355" = -0.0012097487° = Nutation in ecliptical longitude +8.560" = +0.0023776709° = Nutation in ecliptical obliquity -0.266s = -0.0011099294° = Equation of the equinoxes Mean Ecliptic Obliquity 23° 26' 10.021" = 23.4361169328° Nutation in Obliquity +8.560" = +0.0023776709° True Ecliptic Obliquity 23° 26' 18.581" = 23.4384946036° Jay Tanner - PHP Science Labs - 2024 - 1.7