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
0.627719907407
-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 = 15:03:55 = 0.627719907407 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) = 2460399.33605324074 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 27m 28.682s = 3.4579672786 h 51° 52' 10.23" = 51.8695091796° Local True Sidereal Time at Longitude = -76.8233097222° (W) 03h 27m 28.361s = 3.4578779177 h 51° 52' 05.41" = 51.8681687655° Greenwich Mean Sidereal Time 08h 34m 46.277s = 8.5795212601 h 128° 41' 34.148" = 128.6928189020° Greenwich True Sidereal Time 08h 34m 45.955s = 8.5794318992 h 128° 41' 29.323" = 128.6914784879° ================================================================= Applied Auxiliary Computations Time Factors Corresponding to Full Astronomical JD T = 0.242418509328 Julian centuries reckoned from J2000.0 t = 0.024241850932 Julian millennia reckoned from J2000.0 Nutations (IAU 2000B Series) -5.259" = -0.0014609639° = Nutation in ecliptical longitude +9.246" = +0.0025682689° = Nutation in ecliptical obliquity -0.322s = -0.0013404141° = Equation of the equinoxes Mean Obliquity of the Ecliptic 23° 26' 10.101" = 23.4361390496° True Obliquity of the Ecliptic 23° 26' 19.346" = 23.4387073185°
Jay Tanner - PHP Science Labs - 2024 - 1.7