MAKING A CLOCK ACCURATE : SUNDIAL

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This book presents step-by-step instructions for making a sundial. By its shadow one can read correctly, clock time, and also observe the effects of the earth’s tilt, its rotation, and changing orbital speed. On a moonlit night, from the shadow cast on the ‘moondial’, one can notice the moon’s counter-clockwise orbit of the earth showing a small loss of time hour after hour, explaining why a lunar month is more than a day shorter than a solar month.