Leningrad: Scientific book publishing, 1929. — 68 s. : il. — (Library of the journal "In the workshop of nature" For skillful hands) . If there is no clock? Is it then possible to know the time directly through the celestial bodies? Is it possible to arrange such devices that would force the Sun, the Moon and the stars to answer the question: "What time is it?" It is possible. In this book, we will give a description of the simplest ways to determine time with homemade devices. We will begin our description with the simplest and easiest methods and gradually move on to more complex methods. In general, the more accurately it is desirable to have time, the more difficult will be the ways of determining it .. To make a solar or stellar clock that will give time to an hour is very simple, to determine the same from observations of the sky a minute is a rather difficult task.