9
The Celestial Sphere Celestial Equator Ecliptic Two intersecting planes -- the 4 cardinal pts – equinoxes and solstices
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, 2009 -- India, China, Pacific
annular Jan 15, 2010 -- 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
