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
2460668.5
0.811770833333
-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 Dec 24 [Tuesday] Gregorian JD Number = 2460669 JD00 = 2460668.5 = JD for 00h of date Local Time = 19:28:57 = 0.811770833333 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) = 2460669.520104166666 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 37m 44.170s = 1.6289361443 h 24° 26' 02.55" = 24.4340421641° Local True Sidereal Time at Longitude = -76.8233097222° (W) 01h 37m 44.134s = 1.6289262373 h 24° 26' 02.02" = 24.4338935601° Greenwich Mean Sidereal Time 06h 45m 01.764s = 6.7504901258 h 101° 15' 26.467" = 101.2573518865° Greenwich True Sidereal Time 06h 45m 01.729s = 6.7504802188 h 101° 15' 25.932" = 101.2572032824° ================================================================= Applied Auxiliary Computations Time Factors Corresponding to Full Astronomical JD T = 0.249815745493 Julian centuries reckoned from J2000.0 t = 0.024981574549 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) -0.583" = -0.0001619684° = Nutation in ecliptical longitude +8.612" = +0.0023922968° = Nutation in ecliptical obliquity -0.036s = -0.0001486040° = Equation of the equinoxes Mean Ecliptic Obliquity 23° 26' 09.754" = 23.4360428670° Nutation in Obliquity +8.612" = +0.0023922968° True Ecliptic Obliquity 23° 26' 18.367" = 23.4384351638°
Jay Tanner - PHP Science Labs - 2024 - 1.7