8A
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Planetary Astronomy
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8A10.10 -Orrery
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8A10.25 -Phases of the Moon
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8A10.55 -Retrograde Motion
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8A10.80 -Celestial Sphere
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8A20.10 -World Globe
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8A20.20 -Crater Formation Model
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8A30.u1 -Tidal Forces
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8A40.1 -Globe of the Moon
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8A40.11 -Globe of Venus
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8A40.12 -Globe of Mars
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8B
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Stellar Astronomy
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8B10.65 -Pulsar Model
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8B10.u1 -Solar Plasma Model
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8B10.u2 -Eclipsing Binary Stars
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8B10.u3 -AstroJax
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8C
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Cosmology
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8C10.10 -Expanding Universe
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8C10.15 -Expanding Universe Balloon
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8C10.u1 -Universe in a Box
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8C10.u2 -Accretion Disk
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