Educator Ruth Mork teaches kids about clocks — from sundials to cuckoo clocks to roosters. Ruth Mork introduces clocks of all kinds — sundials, candle clocks, hourglasses, cuckoos, even a rooster! She ...
These days, you probably aren’t going to consult a sundial. But the ancient time-telling devices are all over DC, and we were curious to learn more about them. Photograph by Evy Mages.. Dedicated in ...
“A sundial for sounding the hours,” from Athanasius Kircher’s Ars magna lucis et umbrae (Rome, 1646) (courtesy Linda Hall Library of Science, Engineering & Technology) On Time: The Quest for Precision ...
Originally published: New York : Plenum Press, 1998. siris_sil_562392 ...
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