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The Celestial Sphere

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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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Presentation Transcript
slide1

The Celestial Sphere

Celestial Equator

Ecliptic

Two intersecting planes -- the 4 cardinal pts – equinoxes and solstices

slide6

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

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An Eclipse of the Sun

3 types – total, partial, annular

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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