julianCenturyAnomaly {oce} | R Documentation |
Convert a Julian-Day number to a time in julian centuries since noon on January 1, 1900. The method follows Meese (1982 equation 15.1). The example reproduces the example provided by Meeuse (1982 example 15.a), with fractional error 3e-8.
julianCenturyAnomaly(jd)
jd |
a julian day number, e.g. as given by |
Julian century since noon on January 1, 1900.
Dan Kelley
Meeus, Jean, 1982. Astronomical formuae for Calculators. Willmann-Bell. Richmond VA, USA. 201 pages
Other things related to astronomy: eclipticalToEquatorial
,
equatorialToLocalHorizontal
,
julianDay
, moonAngle
,
siderealTime
, sunAngle
Other things related to time: ctimeToSeconds
,
julianDay
, numberAsHMS
,
numberAsPOSIXct
,
secondsToCtime
,
unabbreviateYear
t <- ISOdatetime(1978, 11, 13, 4, 35, 0, tz="UTC") jca <- julianCenturyAnomaly(julianDay(t)) cat(format(t), "is Julian Century anomaly", format(jca, digits=8), "\n")