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
`2460030.5` ` 0.996562500000 ` ` -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 = +73 sec = +00h 01m 13s
 Double-Click Within Text Area to Select ALL Text SIDEREAL TIME FOR GIVEN DATE, TIME AND LONGITUDE Local Date = 2023 Mar 27 [Monday] Gregorian JD Number = 2460031 JD00 = 2460030.5 = JD for 00h of date Local Time = 23:55:03 = 0.996562500000 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) = 2460031.704895833333 Longitude = -76° 49' 23.915" = -76.8233097222° (W) = -05h 07m 17.594s = -5.1215539815 h ================================================================= Local Mean Sidereal Time at Longitude -76.8233097222° (W) 12h 09m 11.558s = 12.1532105810 h 182° 17' 53.37" = 182.2981587155° Local True Sidereal Time at Longitude = -76.8233097222° (W) 12h 09m 10.947s = 12.1530408669 h 182° 17' 44.21" = 182.2956130039° Greenwich Mean Sidereal Time 17h 16m 29.152s = 17.2747645625 h 259° 07' 17.286" = 259.1214684378° Greenwich True Sidereal Time 17h 16m 28.541s = 17.2745948484 h 259° 07' 08.122" = 259.1189227262° ================================================================= Applied Auxiliary Computations Time Factors Corresponding to Full Astronomical JD T = 0.232353316792 Julian centuries reckoned from J2000.0 t = 0.023235331679 Julian millennia reckoned from J2000.0 Nutations (IAU 2000B Series) -9.989" = -0.0027746545° = Nutation in ecliptical longitude +7.904" = +0.0021956479° = Nutation in ecliptical obliquity -0.611s = -0.0025457116° = Equation of the equinoxes Mean Obliquity of the Ecliptic 23° 26' 10.572" = 23.4362699224° True Obliquity of the Ecliptic 23° 26' 18.476" = 23.4384655703° Jay Tanner - PHP Science Labs - 2023 - 1.7