Eclipses lunar eclipse over DSO. Eclipses occur at new or full moon Solar Lunar.

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Presentation transcript:

Eclipses lunar eclipse over DSO

Eclipses occur at new or full moon Solar Lunar

Why not every full and new moon? 5 degree tilt of the Moon’s orbit means…

…Most new and full: shadow misses

Leads to eclipse seasons now: Sep-Oct/March-April ; Advances ~20days/yr due to 18.6 year nutation

Geometry for Lunar eclipses

Looking out into the shadow

Photo sequence through lunar eclipse

Moon often appears red…

… because of light path

Next lunar eclipse

Geometry of solar eclipses

Eclipse starting with partial phases

Safely viewing a solar eclipse

Almost total: diamond ring effect

Totality

Bailey’s Beads

Sometimes not total. Why? “Annular” eclipse

Moon too far away

Total Solar Eclipse Paths Our next good one – August, 2017 … next good one elsewhere …

Next solar eclipse: Turkey: the avian flue eclipse? Starts in Brazil Ends in Mongolia Russia Sahara

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