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
`2460101.5` ` 0.074687500000 ` ` -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 = 2023 Jun 06 [Tuesday] Gregorian JD Number = 2460102 JD00 = 2460101.5 = JD for 00h of date Local Time = 01:47:33 = 0.074687500000 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) = 2460101.783020833333 Longitude = -76° 49' 23.915" = -76.8233097222° (W) = -05h 07m 17.594s = -5.1215539815 h ================================================================= Local Mean Sidereal Time at Longitude -76.8233097222° (W) 18h 37m 58.915s = 18.6330318936 h 279° 29' 43.72" = 279.4954784037° Local True Sidereal Time at Longitude = -76.8233097222° (W) 18h 37m 58.341s = 18.6328724442 h 279° 29' 35.11" = 279.4930866625° Greenwich Mean Sidereal Time 23h 45m 16.509s = 23.7545858751 h 356° 19' 07.637" = 356.3187881261° Greenwich True Sidereal Time 23h 45m 15.935s = 23.7544264257 h 356° 18' 59.027" = 356.3163963849° ================================================================= Applied Auxiliary Computations Time Factors Corresponding to Full Astronomical JD T = 0.234271951289 Julian centuries reckoned from J2000.0 t = 0.023427195128 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) -9.385" = -0.0026068326° = Nutation in ecliptical longitude +7.166" = +0.0019905001° = Nutation in ecliptical obliquity -0.574s = -0.0023917412° = Equation of the equinoxes Mean Ecliptic Obliquity 23° 26' 10.482" = 23.4362449753° Nutation in Obliquity +7.166" = +0.0019905001° True Ecliptic Obliquity 23° 26' 17.648" = 23.4382354754° Jay Tanner - PHP Science Labs - 2023 - 1.7