Changes were needed to take into account new resolutions of the International astronomical Union, particularly the adoption of the new standard epoch J2000.0, while moreover I profited by the new planetary and lunar theories constructed at the Bureau des Longitudes, Paris. The subjects have been expanded and the content has been improved. The present work is a greatly revised version of the former one. Because these 'personal computers' were not yet within reach of everybody, the aforesaid book was written mainly for the users of pocket calculating machines and therefore calculation methods requiring a large amount of computer memory, or many steps in a program, were avoided as far as possible, or kept to a minimum. When, in 1978, I wrote the first (Belgian) edition of my astronomical Formulae for Calculators, the industry of microcomputers was just starting its worldwide expansion. Crowley, Translation, International Organization for Stan- dardization, Geneva, 2002 (Original work published in 1582).2nd Edition.

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Astronomical algorithms 2nd edition pdf