corona is visible. Lasts only a couple of minutes. 2) Partial Solar Eclipse The penumbral shadow of the Moon falls on the surface of the Earth. Only part of the sun is blocked. ( ̴ 7000 km diameter area) 3) Annular Eclipse The Moon is farther from Earth so the umbral shadow doesn’t reach Earth. A ring of sunlight surrounds the moon. Partial solar eclipse still occurs. 39
Eclipses Total Solar Eclipse of 2017 Longest Duration of Total Solar Eclipse: ̴ 2 min 40 sec40 Where were you?! (Post your solar eclipse pictures to MLS if you took any!)
Eclipses Total Solar Eclipse of 2017: August 21, 2017 I was canoeing up Lake Opeongo in Algonquin park 41 Latitude: 45.7North Between 60-70% totality
Eclipses Total Solar Eclipse of 2017: August 21, 2017 Picture by Glynis, taken in Algonquin Park (~60-70% totality)42
Eclipses Total Solar Eclipse of 2017: August 21, 2017 Picture by Michael Stilwell (Taken in Wyoming)43
Eclipses Total Solar Eclipse of 2017: August 21, 2017 GETTY/STAN HONDA/AFP 44 Bailey’s Beads: Aka ‘Diamond Ring Effect’The Moon’s surface is not flat, but has craters and mountains. As the limb/edge of the moon’s surface and the sun line up, ‘beads’ of sunlight are let through by the Moon’s topography in some areas and not in others.
Eclipses Solar Eclipse from Saturn Cassini Imaging Team, SSI, JPL, ESA, NASA (2006)45
Eclipses Lunar Eclipse: 1)Total Lunar Eclipse The full Moon passes through the umbra of the Earth. This typically lasts an hour. *Note: Sizes and distances are not to scale 2) Partial Lunar Eclipse Part of the full Moon passes through the umbra of the Earth’s shadow. The rest of the moon is in the penumbra. The Moon, Earth, and Sun are not in perfect alignment. 3) Penumbral Lunar Eclipse The full Moon only passes through the penumbra of Earth’s shadow. This is the most common type of lunar eclipse. Pearson, “The Cosmic Perspective”Moon images courtesy of Nathan S. Barrow. (Diagram created by Shelley Witte). airandspace.si.edu 1) 2) 3) 46
Eclipses Total Lunar Eclipse: 47 Why does a total lunar eclipse cover the whole moon and last for at least an hour but a total solar eclipse only covers a small area of earth and lasts for a couple of minutes?
Eclipses Total Lunar Eclipse: 48 Why does the moon turn red during a total lunar eclipse? The Moon is red-tinged at totality due to the scattering of the Sun’s white light through Earth’s atmosphere. This light gets refracted (bent). Blue light gets scattered out more than red light so the moon turns red. We are essentially seeing the reflected light of all sunrises and sunsets on Earth at the same time!
Eclipses Total Lunar Eclipse: 49 What would the Earth look like during a total lunar eclipse if you were on the moon?
Eclipses Lunar Eclipse: NASA/GSFC50
Eclipses Lunar Eclipse: NASA/GSFC51
Eclipses Total Lunar Eclipse: September 28, 2015 Composite image of over 200 pictures! APOD September 29, 2015 52
Williams College Eclipse Expedition - Jay M. Pasachoff, Muzhou Lu, and Craig Malamut Eclipses: •The Moon’s phases change as it orbits Earth •The phases change due varying lighting