The Celestial Sphere Celestial Equator Ecliptic Two intersecting planes -- the 4 cardinal pts – equinoxes and solstices.

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Presentation transcript:

The Celestial Sphere Celestial Equator Ecliptic Two intersecting planes -- the 4 cardinal pts – equinoxes and solstices

The sky from 3 different position on Earth

Origin of the seasons -- tilt of the Earth’s axis

Precession

Phases of the Moon

Eclipses of the Sun and Moon Solar – new moon Lunar – full moon Moon must be at one of the nodes of its orbit and the line nodes points to the Sun

An Eclipse of the Sun 3 types – total, partial, annular

Eclipse of the Moon

Next eclipses Solar -- total July 22, India, China, Pacific annular Jan 15, Africa, Indian Ocean, China total July 11, 2011 – S. Pacific (Cook Islands, Easter Is. Aug 21, 2017 April 8, 2024 * Aug 23, 2044 Aug 12, 2045 Lunar -- Penumbral Feb 9, W. US -- Partial Dec 31, E. Hemisphere

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