HR Diagram 

HR Diagram Explorer

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Spectral Classification

Luminosity

Hertzsprung-Russell Diagram

Planetary Orbits Lab

Planetary Orbit Simulator

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Kepler's Law of Planetary Motion

Newton and Planetary Motion

Lunar Phases

Lunar Phase Simulator

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Moon Phases and the Horizon Diagram

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Moon Bisector Demo

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Background Page 1

Background Page 2

Background Page 3

Background Page 4

Background Page 5

Background Page 6

Solar System Models

Geocentric Model

Ptolemy's Model Simulation

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Basic Observations

Elongation

Heliocentric Model

Planetary Configuations Simulator

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Elongations and Configutations

Heliocentrism

Copernican Derivations

 

 

Basic Coordinates and Seasons

 

Seasons and Ecliptic

Seasons and Ecliptic Simulator

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Orbits and Light

Terrestrial Coordinates

Units of longitude and latitude

Finding longitude and latitude

A bit of history

Flat Map Explorer

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Globe Explorer

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Celestial Equatorial Coordinates

Celestial Equator, Declination, Right Ascension

Flat Sky Map Explorer

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Sky Map Explorer

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