Motion of the Sun Models

thingiverse

Here are models that illustrate the movement of the sun. OpenSCAD code that creates models for any latitude is included. Four example are provided for cities at North Latitudes of 33, 42, 51, and 70 degrees and one for Rio de Janeiro at 23 degrees South Latitude. The idea for the models comes from the geomancy web site -http://www.geomancy.org/index.php/astronomy/orthographic-projections Print Settings Printer Brand: MakerBot Printer: MakerBot Replicator (5th Generation) Rafts: Yes Supports: No Resolution: 0.3 mm Instructions For North Latitude Models The models show the yearly movement of the sun in the sky. The hemisphere represents the sky, consider yourself to be looking upwards from the center of the circle that forms the base. The arc from due east to due west represents the movement of the sun through the sky on March 21st and September 21st, the equinoxes. The arc marked with an X represents the movement of the sun on June 21st, the summer solstice, and the arc marked with an O represents the movement of the sun on December 21st, the winter solstice. During the year the sun takes paths between the solstices. If the viewer is at a latitude greater than 66 degrees the winter solstice does not appear and the summer solstice makes a complete circle, the midnight sun. The models are marked at the base at intervals of 10 degrees. These can be used to find azimuths for the solstice sunrises and sunsets. Start at due north and count towards the east. The arc from due north to due south is also marked at 10 degree intervals. It can be used to determine the altitude of the sun at the solstices. Start at due south and count towards the north. See the geomancy web site for more information.