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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