![]() ![]() This simulator allows both orbital and celestial sphere representations of the seasonal motions.Ĭoordinate Systems Comparison, Rotating Sky Explorer Shows the geometry of Earth and Sun over the course of a year, demonstrating how seasons occur. Shows how the direction of the sun at sunrise or sunset changes over the course of the year.ĭemonstrates how the stars of the big dipper, which are at various distance from earth, project onto the celestial sphere to give the familiar asterism. Shows how the sun's most direct rays hit different parts of the earth as the seasons change. Models the motions of the sun in the sky using a horizon diagram, demonstrating daily and seasonal changes in the sun's position. Sun Motions Demonstrator, Motions of the Suns Simulator Shows the paths of the sun on the celestial sphere. NAAP - Motions of the Sun - Sun Paths Page Shows how the declination of the sun varies over the course of a year using a horizon diagram. Shows the sun's position in the sky relative to the background stars (the zodiac constellations) over the course of a year.ĭemonstrates latitude and longitude with an interactive globe, providing an analogy to the celestial and horizon coordinate systems.ĭemonstrates latitude and longitude on an interactive flat map of Earth.Ĭelestial-Equatorial (RA/Dec) Demonstratorĭemonstrates the celestial-equatorial (RA/dec) coordinate system, where declination and right ascension define an object's position on the celestial sphere.ĭemonstrates latitude and longitude on an interactive flat map of the celestial sphere. ![]() Shows how obliquity (orbital tilt) is defined. Daily and yearly motions of the sunlight pattern can be shown. Simulation showing daylight and nighttime regions on a flat map of Earth. Shows how the sun's declination and right ascension change over the course of a year.ĭemonstrates the changing declination of the sun with a time-lapse movie, which shows how the shadow of a building changes over the course of a year.ĭemonstrates the horizon coordinate system, where altitude and azimuth define an object's position in the sky. Shows how an observer's latitude determines the circumpolar, rise and set, and never rise regions in the sky. Shows the geometry in a horizon diagram for calculating the meridional altitude of objects. NAAP - Motions of the Sun - Meridional Altitude Page ![]() Shows the geometry for calculating the meridional altitude of objects. Shows how stars rotate around the North Star over time (both daily and seasonal motions are shown).ĭemonstrates how Ptolemy's geocentric model accounts for the movements of the planets. Shows how small angles can be approximated.ĭemonstrates how the day of the year when a star is first visible in the morning (the heliacal rising) depends on the observer's latitude and the star's position on the celestial sphere. The table reflects a desire to retain the previous organization schemes while effectively pushing both of them together. In NAAP the simulations are a mixture of simulations that run in their own Native App windows and a few small ones are actually embedded in a web page. In ClassAction look under the Animations tab where simulations are organization by topic. Thumbnails are available if you need to have your memory jogged. The table below contains a crude categorization scheme and pointers to simulations in both the NAAP and ClassAction packages. Simulation Content Guide Simulation Content Guide ![]()
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