Perelman Y. Astronomy For Entertainment 1958 Rep

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Books on popular science are often rebuked for not being sufficiently serious. In a way the rebuke is just, and support for it can be found (if one has in mind the exact natural sciences) in the tendency to avoid calculations in any shape or form. And yet the reader can really master his subject only by learning how to reckon, even though in a rudimentary fashion. Hence, both in Astronomy for Entertainment and in other books of this series, the author has not attempted to avoid the simplest of calculations.
Unfortunately Y. Perelman never wrote the continuation he had planned for this book, as untimely death in warbound Leningrad in 1942 interrupted his labours. Later several minor changes were made to bring this book up to date