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The Celestial Sphere

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.

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The Celestial Sphere

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

  2. The sky from 3 different position on Earth

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

  4. Precession

  5. Phases of the Moon

  6. 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

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

  8. Eclipse of the Moon

  9. Next eclipses Lunar -- no major ones 2012, none visible from N America Total – 2014 Apr 14, Oct 8 Solar -- annular May 20, 2012 W. US total Nov 13, 2012 – S. Pacific Aug 21, 2017 April 8, 2024 * Aug 23, 2044 Aug 12, 2045

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