PHP Science labs - Basic Astronomical Statistics

BASIC ASTRONOMICAL STATISTICS DATE UD YMD = 2012 May 19 - Saturday (Gregorian) TIME UT HMS = 00 00 00.000 = 0 day = UTFrac ±DELTA T HMS = +00 00 00.000 = 0 day = dTFrac JD12 = 2456067 = Standard JD number for calendar date JD00 = 2456066.5 = (JD12 - 0.5) = JD number at 00h (start) of date JD = 2456066.5 = (JD00 + UTFrac + dTFrac) = General JD number TIME VARIABLE CORRESPONDING TO GENERAL JD T = 0.123791923340 = Julian centuries reckoned from J2000.0 ============================================================================= GEOGRAPHIC LOCATION DATA Longitude = 0° = -0° 00' 00" = +0.0000000000h = +00h 00m 00.0s Latitude = 0° = +0 00 00 Elevation = 0 m Sunrise = 05:52 Sunset = 18:00 rho*Sin(phi) = +0.0000000000 rho*Cos(phi) = +1.0000000000 ============================================================================= LOCAL SIDEREAL TIME AT GEOGRAPHIC LOCATION Mean = 15.8043460000h = 15h 48m 15.646s = 237.06519° = 237° 03' 54.684" True = 15.8045934878h = 15h 48m 16.537s (1980 nutation series) = 237.068902318° = 237° 04' 08.048" True = 15.8045936541h = 15h 48m 16.537s (2000B nutation series) = 237.068904812° = 237° 04' 08.057" ============================================================================= GREENWICH SIDEREAL TIME Mean = 15.8043460000h = 15h 48m 15.646s = 237.06519° = 237° 03' 54.684" True = 15.8045934878h = 15h 48m 16.537s (1980 nutation series) = 237.068902318° = 237° 04' 08.048" True = 15.8045936541h = 15h 48m 16.537s (2000B nutation series) = 237.068904812° = 237° 04' 08.057" ============================================================================= OBLIQUITY OF THE ECLIPTIC (Laskar) Mean = 23.4376814967° = 23° 26' 15.653" True = 23.4365753703° = 23° 26' 11.671" (1980 nutation series) = 23.4365744262° = 23° 26' 11.668" (2000B nutation series) ============================================================================= NUTATION IN OBLIQUITY (True - Mean) dEps = -0.0011061264° = -3.982" (1980 nutation series) = -0.0011070706° = -3.985" (2000B nutation series) NUTATION IN LONGITUDE (True - Mean) dPsi = +0.0040461187° = +14.566" (1980 nutation series) = +0.0040488372° = +14.576" (2000B nutation series) NUTATION IN RIGHT ASCENSION (True - Mean) = EQUATION OF THE EQUINOXES dRA = +0.0037123176° = +13.364" = +0.8910s (1980 nutation series) = +0.0037148119° = +13.373" = +0.8916s (2000B nutation series)

Basic Astronomical Statistics For Any Given Date, Time and Location
Date: ±Y M D	Time UT: H M S	ΔT: ± H M S

Calendar Mode: Julian Gregorian
Longitude ± D M S (Neg = W)	Latitude ± D M S (Neg = S)	Elevation (± m)