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
2460671.5
0.924247685185
-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 27 [Friday] Gregorian JD Number = 2460672 JD00 = 2460671.5 = JD for 00h of date Local Time = 22:10:55 = 0.924247685185 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) = 2460672.632581018518 Longitude = -76° 49' 23.915" = -76.8233097222° (W) = -05h 07m 17.594s = -5.1215539815 h ================================================================= Local Mean Sidereal Time at Longitude -76.8233097222° (W) 04h 31m 58.443s = 4.5329008958 h 67° 59' 36.65" = 67.9935134365° Local True Sidereal Time at Longitude = -76.8233097222° (W) 04h 31m 58.417s = 4.5328936358 h 67° 59' 36.26" = 67.9934045366° Greenwich Mean Sidereal Time 09h 39m 16.038s = 9.6544548773 h 144° 49' 00.563" = 144.8168231589° Greenwich True Sidereal Time 09h 39m 16.011s = 9.6544476173 h 144° 49' 00.171" = 144.8167142590° ================================================================= Applied Auxiliary Computations Time Factors Corresponding to Full Astronomical JD T = 0.249900960465 Julian centuries reckoned from J2000.0 t = 0.024990096046 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) -0.427" = -0.0001186935° = Nutation in ecliptical longitude +8.487" = +0.0023574152° = Nutation in ecliptical obliquity -0.026s = -0.0001088999° = Equation of the equinoxes Mean Ecliptic Obliquity 23° 26' 09.750" = 23.4360417590° Nutation in Obliquity +8.487" = +0.0023574152° True Ecliptic Obliquity 23° 26' 18.237" = 23.4383991743°
Jay Tanner - PHP Science Labs - 2024 - 1.7