JP3087838U - Solar diurnal motion interpreter - Google Patents

Abstract

(57) [Summary] [Problem] In the present invention, since the sun's rays travel along the surface of a cone or disk (plane) to the observer, the cone 2
An individual and a disk are combined and fixed on an axis so that the desired diurnal motion and shadow curve of the sun in various parts of the world can be three-dimensionally explained in a short time. SOLUTION: A summer solstice cone 3, a winter solstice cone 4, and a vernal equinox disc 5 having an apex angle of 133.2 ° are fixed to linear axes passing through their respective centers. If the North Pole 1 or South Pole 2 is tilted at an angle equal to the latitude of each location, the heavenly North Pole or South Pole is indicated.
When submerged in water so that P comes to the surface of the water in that posture,
The diurnal motion of the daytime sun seen from P is displayed on the water surface.
Below the water is night. Also, if the posture is slightly raised upward, the boundary line between the cone and the disk and the water surface becomes a shaded curve of P.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention is an astronomical teaching tool on the diurnal movement of the sun.

[0002]

[Prior art]

 It mainly draws a spherical surface on paper and illustrates the three types of diurnal motions, the equinox of the vernal equinox, the summer solstice, and the winter solstice.

[0003]

[Problems to be solved by the invention]

 Conventional illustrations of the diurnal movement of the sun and the shadow curve are elusive because they are drawn on a plane, and they are specific to a specific point. You cannot know about any point on the earth. It solves this problem and displays the sun's diurnal motion and shade curve in various parts of the world in three dimensions.

[0004]

[Means for Solving the Problems]

 If we consider the sun rays shining on one point on the ground continuously all day, it will be a cone. The apex angle of the cone for the summer and winter solstice is 133.2 ゜, which is 180 ゜ minus twice the average ecliptic inclination of 23.4 ゜. The equinox becomes a disk (plane). At the center of the circle on both sides of this disc, a cone with an apex angle of 133.2 ゜ (including the approximate value) is combined so that its apex contacts each other, and fixed on an axis passing through the center of the cone and the disc. This solves the above problem.

[0005]

[Embodiment of the invention]

 As shown in FIGS. 1 and 2, the summer solstice cone 3, the winter solstice cone 4 and the vernal equinox disk 5 both having the apex angle of 133.2 ° are fixed on a linear axis passing through their respective centers. The axis of the equinox disk 5 is perpendicular to the axis. The axis comprises a north pole 1 and a south pole 2. There is no limitation on the size, and the circle on the bottom of the cone and the circle on the disk need not be equal. The bottom of the cone may not be necessary, but it will provide reinforcement. Also, as shown in FIG. 1, since the structure is the same as that of the equinox disk 5 and is bilaterally symmetric, the north pole 1 can be used also as the south pole. When the North Pole 1 is used as the South Pole, it is necessary to read the summer solstice cone as the winter solstice cone, the winter solstice cone as the summer solstice cone, and the names of the cones conversely.

FIG. 3 is an external view of the solar diurnal motion indicator according to the present invention. To select and set a desired point on the earth, tilt the North Pole 1 or the South Pole 2 with respect to the horizontal plane at an angle corresponding to the latitude of that point. There are various ways to set the angle, such as attaching a protractor and pointer to the shaft. In this way, the orientation of North Pole 1 or South Pole 2 indicates the heavenly North Pole or South Pole at that point. For example, in the case of a point 35 degrees north latitude, the north pole 1 is inclined 35 degrees with respect to the horizontal plane. The orientation of Arctic Axis 1 points to the heavenly North Pole at this point. FIG. 3 generally looks like this. In this state, if the point P where the apex of the cone contacts the center of the disk is submerged in the water so that it comes to the surface of the water, the diurnal motion of the daytime sun seen from P is displayed on the surface of the water, Explain altitude and length of day. Below the water is night. Further, if the posture is slightly raised in this posture, the boundary line between the cone and the disk and the water surface becomes a shaded curve of P. It is also possible to create a self-made teaching material, such as drawing a development view of a cone on paper, cutting it out with scissors or the like, and attaching it with an adhesive to assemble it.

[0007]

[Effect of the invention]

 The diurnal motion indicator for the sun according to the present invention can be set easily and in a short time at any point if the latitude of the desired point on the earth is known, and explains the path of the sun, the altitude in the south and the length of the day. it can. Because the sun's rays are designed to travel on the surface of a cone and a disk, it has a three-dimensional effect and is easy to understand. In addition, since surfaces were used instead of lines, it was possible to directly see the shadow curve. If the surface is submerged in horizontal sand instead of water, the boundaries will be clear and observation will be possible for a long time. It is considered to be easy to explain due to its simple structure and to be highly practical.

[Brief description of the drawings]

FIG. 1 is a front view of a solar circadian motion explanation device according to the present invention.

FIG. 2 is a side view of the solar circadian motion indicator according to the present invention.

FIG. 3 is an external view of a solar diurnal motion explainer according to the present invention.

[Explanation of symbols]

 1 Arctic Axis 2 Antarctic Axis 3 Summer Solstice Cone 4 Winter Solstice Cone 5 Equinox Equinox Disk

Claims (1)

[Utility model registration claims] 1. A diurnal motion indicator for the sun in which a cone is combined with the center of each of the circles on both sides of a disk so that their vertices are in contact with each other and fixed on an axis passing through the center of the cone and the disk.