Eclipses lunar eclipse over DSOEclipses lunar eclipse over DSO

Eclipses occur at new or full Eclipses occur at new or full moonmoon

Solar

Lunar

Why not every full and new Why not every full and new moon?moon?

5 degree tilt of the Moon’s orbit means…

……Most new and full: shadow Most new and full: shadow missesmisses

Leads to eclipse Leads to eclipse seasonsseasons

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

Geometry for Lunar eclipsesGeometry for Lunar eclipses

Looking out into the shadowLooking out into the shadow

Photo sequence through lunar Photo sequence through lunar eclipseeclipse

Moon often appears red…Moon often appears red…

… … because of light pathbecause of light path

Next lunar Next lunar eclipseeclipse

Geometry of Geometry of solarsolar eclipses eclipses

Eclipse starting with Eclipse starting with partial partial phasesphases

Safely viewing a solar eclipseSafely viewing a solar eclipse

Almost total: diamond ring Almost total: diamond ring effecteffect

TotalityTotality

Bailey’s BeadsBailey’s Beads

Sometimes not total. Why?Sometimes not total. Why?

“Annular” eclipse

Moon too far awayMoon too far away

Total Solar Eclipse PathsTotal Solar Eclipse Paths

Our next good one – August, 2017 … next good one elsewhere …

Next solar eclipse:Next solar eclipse:

Turkey: the avian flue eclipse?

Starts in Brazil

Ends in MongoliaRussia

Sahara