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
`2460368.5` ` 0.422337962963 ` ` -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 Feb 28 [Wednesday] Gregorian JD Number = 2460369 JD00 = 2460368.5 = JD for 00h of date Local Time = 10:08:10 = 0.422337962963 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) = 2460369.130671296296 Longitude = -76° 49' 23.915" = -76.8233097222° (W) = -05h 07m 17.594s = -5.1215539815 h ================================================================= Local Mean Sidereal Time at Longitude -76.8233097222° (W) 20h 32m 38.437s = 20.5440102608 h 308° 09' 36.55" = 308.1601539114° Local True Sidereal Time at Longitude = -76.8233097222° (W) 20h 32m 38.169s = 20.5439358503 h 308° 09' 32.54" = 308.1590377548° Greenwich Mean Sidereal Time 01h 39m 56.031s = 1.6655642423 h 24° 59' 00.469" = 24.9834636338° Greenwich True Sidereal Time 01h 39m 55.763s = 1.6654898318 h 24° 58' 56.451" = 24.9823474771° ================================================================= Applied Auxiliary Computations Time Factors Corresponding to Full Astronomical JD T = 0.241591531041 Julian centuries reckoned from J2000.0 t = 0.024159153104 Julian millennia reckoned from J2000.0 Nutations (IAU 2000B Series) -4.380" = -0.0012165380° = Nutation in ecliptical longitude +9.206" = +0.0025571601° = Nutation in ecliptical obliquity -0.268s = -0.0011161567° = Equation of the equinoxes Mean Obliquity of the Ecliptic 23° 26' 10.139" = 23.4361498024° True Obliquity of the Ecliptic 23° 26' 19.345" = 23.4387069625° Jay Tanner - PHP Science Labs - 2024 - 1.7