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Seasons - Midday all Year

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Hot or Cold? Exploring Axial tilt

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Day and Night simulation animations

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Average: 3 (1 vote)
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RotCurve-Applet (rotation curves of spiral galaxies)

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Average: 3 (1 vote)
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Newtonian telescope-schematic

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Telescope - schematic

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Telscopes - Pictures

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Linsen - Bildkonstruktion

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Fernrohre - Animationen

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Lenses - java applet

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