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Astronomy Lesson 5: How Round the Earth? How Far the Sun?
Wherein we chat about how we know the size of the Earth, and how that can be used to determine the distance to the Sun, given that Venus does a transit across the Sun.
- NASA's Lunar Eclipse page
- Lunar Eclipses
- Venus Transit SDO
- Seeing Earth's Curvature
- Using the transit of Venus to determine the Astronomical Unit