julianCenturyAnomaly | R Documentation |
Convert a Julian-Day number to a time in julian centuries since noon on January 1, 1900. The method follows Equation 15.1 in Reference 1. The example reproduces the Example 15.a of the same source, 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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