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
2460398.5
0.318622685185
-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 Mar 29 [Friday] Gregorian JD Number = 2460399 JD00 = 2460398.5 = JD for 00h of date Local Time = 07:38:49 = 0.318622685185 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) = 2460399.026956018518 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 01m 09.564s = 20.0193232251 h 300° 17' 23.45" = 300.2898483765° Local True Sidereal Time at Longitude = -76.8233097222° (W) 20h 01m 09.242s = 20.0192338172 h 300° 17' 18.63" = 300.2885072574° Greenwich Mean Sidereal Time 01h 08m 27.158s = 1.1408772066 h 17° 06' 47.369" = 17.1131580989° Greenwich True Sidereal Time 01h 08m 26.836s = 1.1407877987 h 17° 06' 42.541" = 17.1118169798° ================================================================= Applied Auxiliary Computations Time Factors Corresponding to Full Astronomical JD T = 0.242410046708 Julian centuries reckoned from J2000.0 t = 0.024241004670 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) -5.262" = -0.0014617324° = Nutation in ecliptical longitude +9.261" = +0.0025726080° = Nutation in ecliptical obliquity -0.322s = -0.0013411191° = Equation of the equinoxes Mean Ecliptic Obliquity 23° 26' 10.101" = 23.4361391597° Nutation in Obliquity +9.261" = +0.0025726080° True Ecliptic Obliquity 23° 26' 19.362" = 23.4387117677°
Jay Tanner - PHP Science Labs - 2024 - 1.7