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
2459847.5
0.822719907407
-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 = +73 sec = +00h 01m 13s
Double-Click Within Text Area to Select ALL Text
SIDEREAL TIME FOR GIVEN DATE, TIME AND LONGITUDE Local Date = 2022 Sep 25 [Sunday] Gregorian JD Number = 2459848 JD00 = 2459847.5 = JD for 00h of date Local Time = 19:44:43 = 0.822719907407 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) = 2459848.53105324074 Longitude = -76° 49' 23.915" = -76.8233097222° (W) = -05h 07m 17.594s = -5.1215539815 h ================================================================= Local Mean Sidereal Time at Longitude -76.8233097222° (W) 19h 56m 40.802s = 19.9446672633 h 299° 10' 12.03" = 299.1700089490° Local True Sidereal Time at Longitude = -76.8233097222° (W) 19h 56m 40.043s = 19.9444563654 h 299° 10' 00.64" = 299.1668454810° Greenwich Mean Sidereal Time 01h 03m 58.396s = 1.0662212448 h 15° 59' 35.947" = 15.9933186714° Greenwich True Sidereal Time 01h 03m 57.637s = 1.0660103469 h 15° 59' 24.559" = 15.9901552033° ================================================================= Applied Auxiliary Computations Time Factors Corresponding to Full Astronomical JD T = 0.227338290300 Julian centuries reckoned from J2000.0 t = 0.022733829030 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) -12.413" = -0.0034479637° = Nutation in ecliptical longitude +7.147" = +0.0019853187° = Nutation in ecliptical obliquity -0.759s = -0.0031634680° = Equation of the equinoxes Mean Ecliptic Obliquity 23° 26' 10.806" = 23.4363351303° Nutation in Obliquity +7.147" = +0.0019853187° True Ecliptic Obliquity 23° 26' 17.954" = 23.4383204490°
Jay Tanner - PHP Science Labs - 2022 - 1.7