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As the Sun moved in the sky, the dark shadow on the sundial showed the change of time.
Of course, sundials didn’t work when there was no sun – at night or on a cloudy day!
The other topics include the education of architects, technical devices like sundials and water clocks, mechanical devices for war, and the ethnography of various peoples.
Then he learned to draw the various designs of sundials, indicating the hours exactly, and to measure the height of objects by geometric rule.
He also mentioned how to apply this method in surveys and how to expand the principles of the gnomon to make sundials.
A sundial is a wholly unreliable method of measuring time, and so is a clock.
Improved communications and better clocks revealed another problem with using a sundial as a clock.
Then, what is to happen to the sundials?
He asked for a miracle, and it was suggested that the shadow might go backwards over the sundial for a considerable number of hours.
They are trying to judge it with a sundial set the wrong way round.
I remember as a boy looking at a sundial and finding that, having set it correctly, after about a week or a month it moved.
About 4,000 years ago sundials were developed to show, more accurately than just the guesswork of looking at the heavens, the divisions of the day as the sun moved round.
He spoke of a sundial.
Reference has been made to sundials.
The location features sculptures, a sundial, interpretive signage, a naked eye observatory and a ceremonial fire pit.
Over the doorway in the porch is a sundial, and the date 1775 is engraved in the apex of its gable.
He also wrote on mechanical devices like the astrolabe and sundial.
