Eclipses Lunar and Solar Eclipses. Sun and Moon have almost the same angular diameters Each subtend an angle ~ ½ degree Sun is 400 times larger than the.

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Presentation transcript:

Eclipses Lunar and Solar Eclipses

Sun and Moon have almost the same angular diameters Each subtend an angle ~ ½ degree Sun is 400 times larger than the Moon and 400 times further away

Solar and Lunar Eclipses Everyone on Dark side of Earth sees a Lunar Eclipse, only a few will see a solar eclipse – shadow sizes!

Slight change in lunar size due to its elliptical orbit around the Earth Causes annular and total solar eclipses

Total Solar Eclipse Moon’s shadow barely reaches the Earth

Lunar Eclipse Earth Shadow easily covers the Moon

Total Solar Eclipse Eclipse Path and Partial Eclipse

Solar Eclipses Corona, comets and diamond ring effect

Annular Eclipse Moon near apogee (too far away)

Lunar Eclipse is often Reddish Due to refraction of Earth’s atmosphere

Red Color and Earth’s Shadow Red color near edges of shadow

Eclipses occur ~ every 6 months Line of nodes must point toward the Sun The alignment is not exact (eclipse limits)