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
`2459807.5` ` 0.000000000000 ` ` +0.208333333333 ` ` +0.000000000000 `
Calendar Mode:    Julian             Gregorian
Longitude:  `±`D M S (Neg=W)
`-76.8233055556`
Optional NASA Polynomial ΔT estimate = +73 sec = +00h 01m 13s
This program uses a cookie to store and remember the above interface settings between calls.
 SIDEREAL TIME FOR GIVEN DATE, TIME AND LONGITUDE Local Date = 2022 Aug 16 [Tuesday] Gregorian JD00 = 2459807.5 = JD for 00h TT of date Local Time = 00:00:00 = 0.000000000000 day T Zone Diff = +05:00 = +0.208333333333 day Delta T = +00:00:00 = +0.000000000000 day Full astronomical Julian Date = Sum of all date/time elements JDTT = 2459807.708333333333 = (JD00 + LTFrac + TZFrac + dTFrac) Date/Time TT Corresponding to Full JD 20220816 05:00:00.0 TT Longitude = -76° 49' 23.9" = -76.8233055556° (W) = -05h 07m 17.6s = -5.1215537037 h ================================================================= Local Mean Sidereal Time at Longitude -76.8233055556° (W) 21h 31m 01s = 21.5169359932 h 322° 45' 15" = 322.7540398980° Local True Sidereal Time at Longitude = -76.8233055556° (W) 21h 31m 00s = 21.5167426802 h 322° 45' 04" = 322.7511402028° Greenwich Mean Sidereal Time at Longitude 0.0° 02h 38m 18.563s = 2.6384896969 h 39° 34' 38.444" = 39.5773454537° Greenwich True Sidereal Time at Longitude 0.0° 02h 38m 17.867s = 2.6382963839 h 39° 34' 28.005" = 39.5744457584° ================================================================= Applied Auxiliary Computations Time Factors Corresponding to Full Astronomical JD T = 0.226220625142 Julian centuries reckoned from J2000.0 t = 0.022622062514 Julian millennia reckoned from J2000.0 Nutations (IAU 2000B Series) -11.378" = -0.0031604654 = Nutation in ecliptical longitude +6.502" = +0.0018061239 = Nutation in ecliptical obliquity -0.696s = -0.0028996952 = Equation of the equinoxes Mean Obliquity of the Ecliptic 23° 26' 10.859" = 23.4363496628 True Obliquity of the Ecliptic 23° 26' 17.361" = 23.4381557867 Jay Tanner - PHP Science Labs - 2022 - 1.5