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
`2460219.5` ` 0.704861111111 ` ` -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 Oct 02 [Monday] Gregorian JD Number = 2460220 JD00 = 2460219.5 = JD for 00h of date Local Time = 16:55:00 = 0.704861111111 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) = 2460220.413194444444 Longitude = -76° 49' 23.915" = -76.8233097222° (W) = -05h 07m 17.594s = -5.1215539815 h ================================================================= Local Mean Sidereal Time at Longitude -76.8233097222° (W) 17h 33m 08.519s = 17.5523664758 h 263° 17' 07.79" = 263.2854971364° Local True Sidereal Time at Longitude = -76.8233097222° (W) 17h 33m 08.027s = 17.5522298048 h 263° 17' 00.41" = 263.2834470717° Greenwich Mean Sidereal Time 22h 40m 26.114s = 22.6739204573 h 340° 06' 31.705" = 340.1088068588° Greenwich True Sidereal Time 22h 40m 25.622s = 22.6737837863 h 340° 06' 24.324" = 340.1067567940° ================================================================= Applied Auxiliary Computations Time Factors Corresponding to Full Astronomical JD T = 0.237519868431 Julian centuries reckoned from J2000.0 t = 0.023751986843 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) -8.044" = -0.0022344355° = Nutation in ecliptical longitude +8.748" = +0.0024299322° = Nutation in ecliptical obliquity -0.492s = -0.0020500647° = Equation of the equinoxes Mean Ecliptic Obliquity 23° 26' 10.330" = 23.4362027442° Nutation in Obliquity +8.748" = +0.0024299322° True Ecliptic Obliquity 23° 26' 19.078" = 23.4386326764° Jay Tanner - PHP Science Labs - 2023 - 1.7