Equatorial sundial principle demonstration instrument

Abstract

The invention discloses an equatorial sundial principle demonstration instrument, which comprises a shell part, a sundial body and a rotation and control part, the shell part is used for installing a sundial body, the rotating and controlling part comprises supporting wheels (6), a cylinder (8), a light source (9), a long hole (10), a friction wheel (13) and a rocking handle (14), the long hole (10) is machined in the surface of the cylinder (8) in the axis direction, the light source (9) capable of sliding is installed on the long hole (10), and the supporting wheels (6) are fixed to annular plates on the front surface and the rear surface of a shell (7). The two ends of the cylinder (8) are clamped between each pair of supporting wheels (6) on the two sides respectively, the cylinder (8) can be driven to rotate by rotating the rocking handle (14) and the friction wheel (13), the light source (9) is arranged at the positions of different solar terms of the long hole (10), the light source (9) rotates along with the cylinder (8), south-north movement of the sun in the equator in different seasons such as winter and summer is simulated, and the working principle of the equatorial sundial is demonstrated.

Description

technical field [0001] The invention relates to a scientific instrument principle demonstration device, in particular to an equatorial sundial principle demonstration device. Background technique [0002] The sundial is a kind of timekeeping instrument used by ancient people to use the sun's shadow to measure the time. Its principle is to use the projection direction of the sun to measure and divide the time. The method of using the sundial to time is a major discovery in the field of astronomical timekeeping. Humans have been using it for thousands of years. [0003] There are many kinds of sundials, among which the equatorial sundial is the most important and common in the sundial world, and it is also the most classic and traditional astronomical observation instrument in ancient China. However, people now generally only know the superficial truth of "using the projection direction of the sun to determine the time", but know little about its profound astronomical princip...

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