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
2460420.5
0.476435185185
-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 = 2024 Apr 20 [Saturday] Gregorian JD Number = 2460421 JD00 = 2460420.5 = JD for 00h of date Local Time = 11:26:04 = 0.476435185185 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) = 2460421.184768518518 Longitude = -76° 49' 23.915" = -76.8233097222° (W) = -05h 07m 17.594s = -5.1215539815 h ================================================================= Local Mean Sidereal Time at Longitude -76.8233097222° (W) 01h 15m 46.113s = 1.2628091994 h 18° 56' 31.70" = 18.9421379906° Local True Sidereal Time at Longitude = -76.8233097222° (W) 01h 15m 45.790s = 1.2627193086 h 18° 56' 26.84" = 18.9407896285° Greenwich Mean Sidereal Time 06h 23m 03.707s = 6.3843631809 h 95° 45' 55.612" = 95.7654477130° Greenwich True Sidereal Time 06h 23m 03.384s = 6.3842732901 h 95° 45' 50.758" = 95.7640993509° ================================================================= Applied Auxiliary Computations Time Factors Corresponding to Full Astronomical JD T = 0.243016694552 Julian centuries reckoned from J2000.0 t = 0.024301669455 Julian millennia reckoned from J2000.0 Nutations (IAU 2000B Series) -5.291" = -0.0014696264° = Nutation in ecliptical longitude +9.185" = +0.0025513202° = Nutation in ecliptical obliquity -0.324s = -0.0013483621° = Equation of the equinoxes Mean Obliquity of the Ecliptic 23° 26' 10.073" = 23.4361312717° True Obliquity of the Ecliptic 23° 26' 19.257" = 23.4386825919°
Jay Tanner - PHP Science Labs - 2024 - 1.7