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 ...

The “minute” on your phone is not a natural thing. Nothing in the sky divides an hour into 60 equal parts. Humans invented ...

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 ...

Timekeeping has always been one of humankind’s greatest fascinations. From observing the sun’s shadow to engineering atomic precision, the evolution of timekeeping devices spans centuries of ...

Atlanta native Jere Blackwelder is standing in front of a packed room in the Brookside Museum. He’s the first to admit that he’s no scientist or mathematician. His fascination lies in the history of ...