julianCenturyAnomaly | R Documentation |
Convert a Julian-Day number to a time in julian centuries since noon on January 1, 1900. The method follows reference 1 equation 15.1. The example reproduces the example provided by reference 1 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. Astronomical Formulas for Calculators. Second Edition. Richmond, Virginia, USA: Willmann-Bell, 1982.
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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")
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