Week 9: The Calendar (Late February)

18th May 1997 5 mins Season 1 Episode 9

Leap Days: The Earth misses a quarter of a day. Gregorian and Orthodox calendars. Solar and lunar calendars. Solid and gaseous planets.

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Season 1 · Episode 10

Week 10: Waning Moon and Solar Eclipses (Early March)

The half-moon shows where we are going. Where the stars go during the day. The Moon and the planets: The Sun's invisible companions. The Moon's shadow on the Earth: Solar Eclipses.

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