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
2460666.5
0.268993055556
-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 22 [Sunday] Gregorian JD Number = 2460667 JD00 = 2460666.5 = JD for 00h of date Local Time = 06:27:21 = 0.268993055556 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) = 2460666.977326388889 Longitude = -76° 49' 23.915" = -76.8233097222° (W) = -05h 07m 17.594s = -5.1215539815 h ================================================================= Local Mean Sidereal Time at Longitude -76.8233097222° (W) 12h 26m 06.662s = 12.4351839985 h 186° 31' 39.94" = 186.5277599771° Local True Sidereal Time at Longitude = -76.8233097222° (W) 12h 26m 06.633s = 12.4351759610 h 186° 31' 39.50" = 186.5276394149° Greenwich Mean Sidereal Time 17h 33m 24.257s = 17.5567379800 h 263° 21' 03.851" = 263.3510696995° Greenwich True Sidereal Time 17h 33m 24.228s = 17.5567299425 h 263° 21' 03.417" = 263.3509491373° ================================================================= Applied Auxiliary Computations Time Factors Corresponding to Full Astronomical JD T = 0.249746128032 Julian centuries reckoned from J2000.0 t = 0.024974612803 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) -0.473" = -0.0001314047° = Nutation in ecliptical longitude +8.649" = +0.0024026306° = Nutation in ecliptical obliquity -0.029s = -0.0001205622° = Equation of the equinoxes Mean Ecliptic Obliquity 23° 26' 09.758" = 23.4360437722° Nutation in Obliquity +8.649" = +0.0024026306° True Ecliptic Obliquity 23° 26' 18.407" = 23.4384464029°
Jay Tanner - PHP Science Labs - 2024 - 1.7