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
`2459847.5` ` 0.825300925926 ` ` -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 = 2022 Sep 25 [Sunday] Gregorian JD Number = 2459848 JD00 = 2459847.5 = JD for 00h of date Local Time = 19:48:26 = 0.825300925926 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) = 2459848.533634259259 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 00m 24.413s = 20.0067813053 h 300° 06' 06.19" = 300.1017195792° Local True Sidereal Time at Longitude = -76.8233097222° (W) 20h 00m 23.653s = 20.0065704007 h 300° 05' 54.80" = 300.0985560106° Greenwich Mean Sidereal Time 01h 07m 42.007s = 1.1283352868 h 16° 55' 30.105" = 16.9250293016° Greenwich True Sidereal Time 01h 07m 41.248s = 1.1281243822 h 16° 55' 18.717" = 16.9218657330° ================================================================= Applied Auxiliary Computations Time Factors Corresponding to Full Astronomical JD T = 0.227338360965 Julian centuries reckoned from J2000.0 t = 0.022733836096 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) -12.413" = -0.0034480732° = Nutation in ecliptical longitude +7.147" = +0.0019853205° = Nutation in ecliptical obliquity -0.759s = -0.0031635686° = Equation of the equinoxes Mean Ecliptic Obliquity 23° 26' 10.806" = 23.4363351294° Nutation in Obliquity +7.147" = +0.0019853205° True Ecliptic Obliquity 23° 26' 17.954" = 23.4383204499° Jay Tanner - PHP Science Labs - 2022 - 1.7