Lecture 2: Spaceship Earth Man is…related inextricably to all reality, known and unknowable…plankton, a shimmering phosphorescence on the sea and the.

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Presentation transcript:

Lecture 2: Spaceship Earth Man 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

Math stuff to review Powers of Ten and Scientific Notation Converting between different units Metric System Finding Ratios See Appendix C in your textbook

Earth’s Rotation

The Earth’s Orbit

The Reason for Seasons Spring Equinox Fall Equinox Summer Solstice Winter Solstice

Summer Solstice at the Arctic Circle

Precession of the Earth’s Axis

Phases of the Moon

Eclipses 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.

Solar Eclipses Total Partial Annular path

A total eclipse of the Sun

Fixed Stars and Wandering Planets

The Sun’s Motion Through the Zodiac

The Mystery of Retrograde Motion Jupiter, shown at one month intervals

Explaining Retrograde Motion

Stellar Parallax

Stellar Motions in the Solar Neighborhood

Rotation in the Galaxy

Hubble’s Law

The Expanding Universe

Astronomical Distance Units Astronomical Unit (AU) 150 million km distances between planets parsec (pc)3.09E13 km distances between stars kilo-parsec (kpc)1000 pc sizes of galaxies Mega-parsec (Mpc)1.0E6 pc distances between galaxies 1 parsec = 3.26 light years

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