Running instrument for sun and earth movement

Abstract

The invention relates to a sun-earth running instrument, which is used as a teaching appliance. The sun-earth running instrument comprises a pedestal, an outer spherical shell, an inner spherical core and a meridian, wherein a T-bar is arranged on the pedestal; a transverse rod of the T-bar is cambered, and the bottom of the transverse rod is provided with a rack; the rack is connected with a motor and a transmission gear pair which are arranged inside the pedestal; a vertical rod of the T-bar is tubular, fixed on the transverse rod and passes through the inner spherical core upwards; the outer spherical shell is made of transparent materials, and subsolar points, a dawn-and-dusk circle and so on are drawn on the outer spherical shell; an earth pattern is drawn on the surface of the innerspherical core; a minor axis is arranged inside a hollow cavity of the inner spherical core, fixed with the inner spherical core through a support and inserted into the vertical rod of the T-bar; anda micromotor and a transmission gear pair which are connected with the minor axis are arranged on the support. The sun-earth running instrument has a simple structure, beautiful shape, high automation degree and strong visible demonstration property, can deepen understanding of students on natural phenomena generated by sun-earth running, and is a more suitable teaching appliance compared with the prior art in the field.

Description

technical field [0001] The invention relates to the technical field of educational demonstration appliances, in particular to teaching instruments reflecting natural phenomena produced by the movement of the earth relative to the sun. Background technique [0002] The inventor once applied for an invention patent for a "Sunshine Earth Phenomena Instrument", publication number: CN1815525A, which is a dome cover composed of two hemispherical shells, the sun cover and the night cover, and placed in the dome cover to represent the sphere of the earth , and the meridian circle set outside the dome cover; the ecliptic line, time difference, direct sun point, sun altitude circle, noon line, etc. are drawn on the dome cover, and there are long strip-shaped chutes at the north and south ends of the dome cover The north-south direction of the sphere is provided with a central axis, i.e. the earth axis, and the two ends of the earth axis pass through the chute of the dome cover into th...

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Problems solved by technology

[0002] The inventor once applied for an invention patent for a "Sunshine Earth Phenomena Instrument", publication number: CN1815525A, which is a dome cover composed of two hemispherical shells, the sun cover and the night cover, and placed in the dome cover to represent the sphere of the earth , and the meridian circle set outside the dome cover; the ecliptic line, time difference, direct sun point, sun altitude circle, noon line, etc. are drawn on the dome cover, and there are long strip-shaped chutes at the north and south ends of the dome cover The north-south direction of the sphere is provided with a central axis, i.e. the earth axis, and the two ends of the earth axis pass through the chute of the dome cover into the center hole provided on the meridian circle, and the upper end of the earth axis passes through the center hole provided on the meridian circle; by rotating the sphere and Swinging the meridian circle can vividly demonstrate the changes of natural phenomena caused by the movement of the earth relative to the sun; the invention has simple structure, novel principle, convenient production, and can achieve the effect of enabling students to grasp knowledge faster; Defects of insufficient intuitiveness and automaticity of operation

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