Websundial. (sʌndaɪəl ) Word forms: sundials. 1. countable noun. A sundial is a device used for telling the time when the sun is shining. The shadow of an upright rod falls onto a flat surface that is marked with the hours, and … WebInteractive Sundials are the oldest known instruments for telling time . The surface of a sundial has markings for each hour of daylight. As the Sun moves across the sky, another part of the sundial casts a shadow on …

What does sundial mean - Definition of sundial - Word finder

WebAug 24, 2024 · If you own an equatorially mounted telescope, you may recognise this setup as the definition of the polar axis – parallel to the rotational axis of the Earth. A variation of this form, the vertical dial, is … WebAn analemmatic sundial uses a vertical gnomon and its hour lines are the vertical projection of the hour lines of a circular equatorial sundial onto a flat plane. Therefore, the analemmatic sundial is an ellipse, where the short axis is aligned North-South and the long axis is aligned East-West.The noon hour line points true North, whereas the hour lines … dr william myers conway sc

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WebSundial. A sundial is a device that tells the time of day by the apparent position of the Sun in the sky. In the narrowest sense of the word it consists of a flat plate (the dial) and a gnomon which casts a shadow onto the dial. As the sun appears to move across the sky, the shadow aligns with different hour-lines which are marked on the dial ... WebMar 22, 2024 · sundial, the earliest type of timekeeping device, which indicates the time of day by the position of the shadow of some object … WebJan 26, 2013 · 1. that an observer at the equator will see the Sun directly overhead at mid-day on the equinoxes. 2. that the Sun will rise due east and set due west on the equinoxes (on all other days the Sun will rise either north or south of east, and set north or south of west) 3. the length of day and night are nearly equal. dr william nantz beaumont tx