Astronomical Algorithms

Description

Stated in book," Virtually every previous handbook on celestial calcuations was forced to rely on formaulae for Sun Moon and planets that were developed in the last century or before 1920. With his special knack for computations of all sorts, the author has made the essential of these modern techniques available to us all.

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This was my first astrometry book, which I received in 8th grade!

Meeus was from the University of Louvain (Leuven).

This JavaScript date of Easter calculator uses the algorithm from Meeus's book (DjVu pp. 73-5):

a = year%19

b = year/100, c = year%100

d = b/4, e = b%4

f = (b+8)/25

g = (b-f+1)/3

h = (19*a+b-d-g+15)%30

i = c/4, k = c%4

l = (32+2e+2i-h-k)%7

m = (a+11h+22l)/451

n = (h+l-7m+114)/31, p = (h+l-7m+114)%31

n = month (3 = March, 4 = April)

p+1 = day of month

For transcriptions of the original texts of Easter algorithm of Clavius, S.J., see: Les textes fondateurs du calendrier grégorien § Les canons.

ch. 10 (DjVu pp. 83-8) are on latitude/longitude (great circle) distance calculation.