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
2460612.5
0.960486111111
-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 Oct 29 [Tuesday] Gregorian JD Number = 2460613 JD00 = 2460612.5 = JD for 00h of date Local Time = 23:03:06 = 0.960486111111 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) = 2460613.668819444444 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 31m 41.249s = 1.5281246759 h 22° 55' 18.73" = 22.9218701385° Local True Sidereal Time at Longitude = -76.8233097222° (W) 01h 31m 41.072s = 1.5280754845 h 22° 55' 16.08" = 22.9211322678° Greenwich Mean Sidereal Time 06h 38m 58.843s = 6.6496786574 h 99° 44' 42.647" = 99.7451798609° Greenwich True Sidereal Time 06h 38m 58.666s = 6.6496294660 h 99° 44' 39.991" = 99.7444419901° ================================================================= Applied Auxiliary Computations Time Factors Corresponding to Full Astronomical JD T = 0.248286620655 Julian centuries reckoned from J2000.0 t = 0.024828662065 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) -2.895" = -0.0008042306° = Nutation in ecliptical longitude +9.337" = +0.0025936893° = Nutation in ecliptical obliquity -0.177s = -0.0007378707° = Equation of the equinoxes Mean Ecliptic Obliquity 23° 26' 09.826" = 23.4360627495° Nutation in Obliquity +9.337" = +0.0025936893° True Ecliptic Obliquity 23° 26' 19.163" = 23.4386564387°
Jay Tanner - PHP Science Labs - 2024 - 1.7