The Great American Eclipse

August 21, 2017

UW Retirement Association

August 2, 2017

Eclipse Timing

Start Total End Dur

Corvallis, OR 9:04 10:16 11:37 1:39

Idaho Falls,

ID10:15 11:33 12:58 1:49

Carbondale,

IL11:52 1:20 2:47 2:37

Greenville,

SC1:09 2:38 4:02 2:10

Seattle

Maximum coverage of sun about 94%

Eclipse begins: 9:08 a.m.

Maximum coverage: 10:20 a.m.

Eclipse ends: 10:20 a.m.

Safe Eclipse Viewing

Partial- Protection

Total- O.K. to look

Topics

What causes eclipses?

Types/times of eclipses

Historical perspectives

Solar eclipse science

Eclipses in modern times

Summary

Partial Eclipse

Annular Eclipse

Total Eclipse

Lunar Eclipse

What’s Different?

2009 2013

Jan 26 Ann Solar Apr 25 Par Lunar

Feb 9 Pen Lunar May 10 Ann Solar

July 7 Pen Lunar May 25 Pen Lunar

July 22 Tot Solar Oct 18 Pen Lunar

Aug 6 Pen Lunar Nov 3 Hybrid Solar

Dec 31 Par Lunar

Early Written Records

Asian Ideas

The Saros (Greek)

Native American

Your TurnHow many solar eclipses have you seen?

When? Where?

Drawings

Photographic Studies

Solar Eclipse Science

Measure positions on Earth

Measure Earth rotation

Study atmosphere of Earth

Chromosphere and corona

General Relativity

Chromosphere

Corona Varies with 11 Year Solar Cycle

General Relativity- 1919 Eclipse

Sir Arthur Eddington

Eclipse Cruises

Eclipse Expeditions

What to Expect on August 21

Near and During Totality

Gets darker

Gets cooler

Wind may change

Animals notice

Diamond Ring

Future Eclipses

Enjoy and Stay Safe!