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Lecture 2: Lecture 2: Spaceship Spaceship
EarthEarthMan is…related inextricably to all reality, known and unknowable…plankton, a shimmering phosphorescence on the sea and the spinning planets and an expanding universe, all bound together by the elastic string of time. It is advisable to look from the tide pool to the stars and then back to the tide pool again.
-- John Steinbeck
The Reason for SeasonsThe Reason for Seasons
Spring Equinox
Fall Equinox
Summer Solstice
Winter Solstice
EclipsesEclipses
Solar eclipse: occurs when the Moon’s shadow falls on the Earth – occurs only at new moon.
Lunar eclipse: occurs when the Moon passes through the Earth’s shadow – occurs only at full moon.
The Mystery of The Mystery of Retrograde MotionRetrograde Motion
Jupiter, shown at onemonth intervals