sundial

sundial   Dan sundial

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

A sundial is a horological device that tells the time of day when direct sunlight shines by the apparent position of the Sun in the sky  As opposed to a normal sundial, an Analemmatic Sundial simply corrects for the motion of the Earth as it travels in an ellipse, not a circle, around the Sun

เสื้อ บา เยิ ร์ น “Be True” Polished Sun Dial · ; “Classic” Polished Brass Sundial No2 · ; Armillary Globe Nickel Plated · ; Armillary Sphere 25″ High · ; Be A sundial is a horological device that tells the time of day when direct sunlight shines by the apparent position of the Sun in the sky