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
2460032.5
0.770462962963
-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 = 2023 Mar 29 [Wednesday] Gregorian JD Number = 2460033 JD00 = 2460032.5 = JD for 00h of date Local Time = 18:29:28 = 0.770462962963 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) = 2460033.478796296296 Longitude = -76° 49' 23.915" = -76.8233097222° (W) = -05h 07m 17.594s = -5.1215539815 h ================================================================= Local Mean Sidereal Time at Longitude -76.8233097222° (W) 06h 50m 36.184s = 6.8433843763 h 102° 39' 02.76" = 102.6507656444° Local True Sidereal Time at Longitude = -76.8233097222° (W) 06h 50m 35.579s = 6.8432163672 h 102° 38' 53.68" = 102.6482455083° Greenwich Mean Sidereal Time 11h 57m 53.778s = 11.9649383578 h 179° 28' 26.671" = 179.4740753667° Greenwich True Sidereal Time 11h 57m 53.173s = 11.9647703487 h 179° 28' 17.599" = 179.4715552306° ================================================================= Applied Auxiliary Computations Time Factors Corresponding to Full Astronomical JD T = 0.232401883539 Julian centuries reckoned from J2000.0 t = 0.023240188353 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) -9.888" = -0.0027467790° = Nutation in ecliptical longitude +7.916" = +0.0021988751° = Nutation in ecliptical obliquity -0.605s = -0.0025201361° = Equation of the equinoxes Mean Ecliptic Obliquity 23° 26' 10.569" = 23.4362692909° Nutation in Obliquity +7.916" = +0.0021988751° True Ecliptic Obliquity 23° 26' 18.485" = 23.4384681660°
Jay Tanner - PHP Science Labs - 2023 - 1.7