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<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Foothill AstroSims Ptolemaic System Simulator</title>
<meta name="description" content="Planetary Phases in the Ptolemaic System, created by Foothill AstroSims." />
<meta property="og:title" content="Ptolemaic Planetary Phases Simulator" />
<meta property="og:description" content="Planetary Phases in the Ptolemaic System, created by Foothill AstroSims." />
<meta property="og:type" content="website" />
<meta property="og:url" content="https://foothillastrosims.github.io/ptolemaic-phases-sim/" />
<meta property="og:image" content="./img/apple-touch-icon.png" />
<link rel="apple-touch-icon" sizes="180x180" href="./img/apple-touch-icon.png">
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<body>
<div id="sim-root"></div>
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<div class="modal-dialog" role="document">
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<h5 class="modal-title" id="helpModalLabel">
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<div class="modal-body">
<p>This simulator models the phases of planets in a simplified Ptolemaic model of the solar system, in which the Earth is motionless near the center.</p>
<p>In this system, the sun circles the Earth once per year. Planets move on a large loop around the Earth - the deferent - and upon a smaller loop called the epicycle. In this model, the rate of the planet's motion was set to match the average time it took to complete a full cycle through the zodiacal constellations (prograde motion), and the epicycle size and rotation rate were set to match the planet's observed occasional retrograde motion.</p>
<p> This simulation is limited to <empha>inferior</empha> planets, which are between the Earth and sun in the Ptolemaic model. </p>
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<p><b> This simulator is an HTML5/Javascript reimplementation and extension of the Venus phases in the Ptolemaic system simulator that was originally developed as part of the University of Nebraska's Class Action project.</b></p>
<p>The original simulation, along with related teaching materials, may be found at: <a href="https://astro.unl.edu" target="_blank">https://astro.unl.edu</a></p>
<p>This simulator is part of the <a href="https://foothill.edu/astronomy/astrosims.html" target="_blank">Foothill AstroSims project</a>, which is aiming to reimplement, in HTML5, Flash-based simulations that are used in Foothill Astronomy courses.</p>
<p>Similar projects include work done by Nik Nyby at Columbia University (<a href="https://github.com/ccnmtl/astro-simulations" target="_blank">https://github.com/ccnmtl/astro-simulations</a>) and Kevin Ditts at the University of New Mexico (<a href="https://physics.unm.edu/Courses/Rand/applets/" target="_blank">https://physics.unm.edu/Courses/Rand/applets/</a>).</p>
<p><i>Funding for <a href="https://foothill.edu/astronomy/astrosims.html" target="_blank">Foothill AstroSims</a> provided by an Equity & Innovation Grant from Foothill College.</i></p>
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