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And the earth edge would start to glow like a ring of

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and the earth edge would start to glow like a ring of sunset.Why does the moon turn red and not black during a lunar eclipse?Because Earth’satmosphere scatters short wave light more then longer wavelengths. As the sunlight passes throughthe Earth’s upper atmosphere,it is bent (refracted) in towards the Moon. But because of thisscattering, only long wave light (red) remains.The darker the eclipse, the dirtier the atmosphere.here we see the moon asit appears during a total eclipse.Line of Nodes– one of two points where the moon’s orbit crosses the Earth’s ecliptic.If a newmoon or a full moon occurs on the line of nodes (when the moon is at the correct angle to fall withinthe earth’s shadow) an eclipse occurs.Asolar eclipseoccurs when the sun is either partially or totally obstructed by the moon.( It isan interesting coincidence that the Moon is the same size in our sky as the sun.Both objects are 100times as far away as they are in diameter.)Stated from Wikipedia another way,the Sun's distance from the Earth is about 400 times theMoon's distance, and the Sun's diameter is about 400 times the Moon's diameter. Because these ratiosare approximately the same, the Sun and the Moon as seen from Earth appear to be approximately
the same size: about 0.5 degree of arc in angular measure,about the size of an aspirin held at arm’slength.Solar eclipses come in three flavours:1) total2) annular3) partialUmbra -the darkest part of the shadow, in which light from the sun is completely blocked.During a total solar eclipse the viewer is located inside the umbral shadow of the moon.Thisrequires you to be in the right location and for the moon to be fairly close to the Earth in its orbit.This is an amazing experience which should not be missed!Penumbra– The outer part of the shadow where the light source is only partiallyblocked. viewing the eclipse from the penumbral shadow results in apartial solar eclipse.People who are not ‘on the line’ but off to one side will get to see a partial eclipse.If the diameter of the moon in the sky is less than the diameter of the sun in the sky,, becausethe Moon is near apogee, (the farthest point from the Earth in its orbit) anannular eclipseoccurs.(The umbral cone does not reach the Earth’s surface.)people in this case who are one the line will seethe moon centered on the sun,but a ring of sun will still be visible around the edge.The sun turnsinto a brilliant “o” in the sky.
If you are ‘on the line’,and the Moon is close enough,you will see the very strikingtotalsolar eclipse. The sky darkens but stays bluish,the air cools,birds roost, streetlights come on.thesun ‘s outer atmosphere becomes visible,an eerie circle of white streamers radiating outwards awayfrom the sun’s surface.Pictures do not do it justice.

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Term
Summer
Professor
Patrick Kelly
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