Primitive Survival

Primitive Technology: Sundial and Survive a day at the seashore wilderness

Hi. sundial and survive a day at the seashore wilderness this is our latest video. In this video we created a clay solar clock and lived in the wilderness. We use survival skills to catch shrimps, fish, oysters, Horseshoe crabs. We caught two Horseshoe crabs and released them to the ocean. A sundial is a device that tells the time of day when there is sunlight by the 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 shades align with the different hour-lines, which are marked on the dial to indicate the time of day. Gnomon, mà có một điểm giới thiệu hoặc nodus có thể được dùng. The gnomon casts a broad shadow; shades of style show the time. The gnomon may be a rod, wire, or elaborately decorated metal casting. The style must be parallel to the axis of the Earth’s rotation for the sundial to be accurate throughout the year. The style of angle from horizontal is equal to the sundial of geographical latitude.

In a broader sense, sundial is any device that uses the Sun’s altitude or azimuth (hoặc cả hai) để hiển thị thời gian. In addition to their time-telling function, sundials are valued as decorative objects, literary metaphors, and objects of mathematical study.
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