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“It would suit a class in astronomy for non-scientists who know the basic rules of algebra and arithmetic and who are prepared for some quantitative work without the use of advanced mathematics; or an adult evening-education class; or amateur astronomers … who have always wanted to know how to do astronomical calculations. … I give it high marks, and anyone working through it thoroughly will acquire a pretty good knowledge of the subject, so go for it.” (Jeremy B. Tatum, The Observatory, Vol. 133 (1236), October, 2013)