. Demonstrates a method for determining moon phases using planes that bisect the earth and moon. NAAP - Hertzsprung-Russell Diagram - Luminosity Page. Shows how a lightcurve is constructed from observations of an eclipsing binary system. Demonstrates the celestial-equatorial (RA/dec) coordinate system, where declination and right ascension define an object's position on the celestial sphere. The purpose of this Demonstration is to visualize the basic principles behind changes in the appearance of the celestial sphere, as it varies with the observer's latitude, time of year, and time of day. This is the preferred coordinate system to pinpoint objects on the celestial sphere. (updated 11/16/2021)This simulation illustrates two views of star motions: 1) a celestial sphere representation where latitude (and the positions of the poles) can be specified, and 2) the view of the observer looking in any of the cardinal directions. Demonstrates latitude and longitude with an interactive globe, providing an analogy to the celestial and horizon coordinate systems. Right ascension (symbol , abbreviated RA) measures the angular distance of an object eastward along the celestial equator from the vernal equinox to the hour circle passing through the object. Astronomy Simulation - JavaLab In astronomy and navigation, the celestial sphere is an imaginary sphere of arbitrarily large radius, concentric with Earth. Planet Earth Simulation. When used together, right ascension and declination are usually abbreviated RA/Dec. Shows how the sun's declination and right ascension change over the course of a year. All objects in the observers sky can be thought of as projected upon the inside surface of the celestial sphere, as if it were the underside of a dome. Illustrates how the movement of a star and its planet about their center of mass compares to a hammer thrower swinging a heavy metal ball. Models the motions of two stars in orbit around each other, and the combined lightcurve they produce. hb```f`` B@1v`-\4Lqu"L& An animation of coins attached to a balloon, providing an analogy to the expansion of the universe. They correspond to Apparent Solar Time and Mean Solar Time, respectively. conceptually intuitive design we don't want to provide directions, narrowly-focused parameter space this isn't a desktop simulation, we have limited screen space, utilization of vector graphics SVGs will look good on smartphones and the desktop, adaptive layout they should effectively resize for the mobile device you are on and adjust between portrait and landscape mode (some window resizing may be necessary on the desktop), utilization of pointer events obtain similar behavior with different pointing devices, logical GUI design sophisticated manipulation should not be needed, embedded questions students need tasks to guide their experimentation in simulations, a descriptive title like "Star Trails Explorer Directions", a QR code to the simulation students will get to the simulation very quickly with this method, the actual URL to the simulation a few students will be using laptops and will need to type this, a small screen shot of the simulation gives students confidence that they have arrived at the right place, very brief directions: "Work out answers in your group to Q1 A through D. We will debrief in 10 minutes.".
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