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
2460518.5
0.320590277778
-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 Jul 27 [Saturday] Gregorian JD Number = 2460519 JD00 = 2460518.5 = JD for 00h of date Local Time = 07:41:39 = 0.320590277778 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) = 2460519.028923611111 Longitude = -76° 49' 23.915" = -76.8233097222° (W) = -05h 07m 17.594s = -5.1215539815 h ================================================================= Local Mean Sidereal Time at Longitude -76.8233097222° (W) 03h 57m 06.673s = 3.9518537102 h 59° 16' 40.10" = 59.2778056529° Local True Sidereal Time at Longitude = -76.8233097222° (W) 03h 57m 06.557s = 3.9518214564 h 59° 16' 38.36" = 59.2773218453° Greenwich Mean Sidereal Time 09h 04m 24.268s = 9.0734076917 h 136° 06' 04.015" = 136.1011153753° Greenwich True Sidereal Time 09h 04m 24.152s = 9.0733754378 h 136° 06' 02.274" = 136.1006315676° ================================================================= Applied Auxiliary Computations Time Factors Corresponding to Full Astronomical JD T = 0.245695521522 Julian centuries reckoned from J2000.0 t = 0.024569552152 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) -1.898" = -0.0005273182° = Nutation in ecliptical longitude +8.867" = +0.0024631227° = Nutation in ecliptical obliquity -0.116s = -0.0004838077° = Equation of the equinoxes Mean Ecliptic Obliquity 23° 26' 09.947" = 23.4360964403° Nutation in Obliquity +8.867" = +0.0024631227° True Ecliptic Obliquity 23° 26' 18.814" = 23.4385595630°
Jay Tanner - PHP Science Labs - 2024 - 1.7