Eclipses1 More About Eclipses. Eclipses2 What Eclipses meant in Ancient Times pomo tribe: The sun got bit by a bear and they are fighting Chinese: dragon/demon.

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Presentation transcript:

Eclipses1 More About Eclipses

Eclipses2 What Eclipses meant in Ancient Times pomo tribe: The sun got bit by a bear and they are fighting Chinese: dragon/demon eating sun Tahitians: moon and sun making love Eskimos: divine province: God is checking in to see everything is okay. Ancient Greeks believed it was a sign the gods were angry and therefore was a bad omen.

Eclipses3 Although the Sun is about 400 times larger than the Moon, it is also about 400 times further away. – Both appear to be about ½ degree across. – As a result of this coincidence, the Moon can completely cover the Sun, producing a total solar eclipse.

Eclipses4 The shadow of any body consists of two parts: – The umbra is where the Sun is completely blocked from view. – The penumbra is where the Sun is only partially blocked.

Eclipses5 Shadows and Eclipses

Eclipses6 Line up of Solar Eclipse

Eclipses7 The Modern View The answer lies hidden among the shadows. Earth Moon

Eclipses8 Shadow Structure Penumbra Umbra

Eclipses9 South Pole North Pole Solar Eclipse Details Sun Moon What is the phase of the moon? New Moon!

Eclipses10 Total Solar Eclipse

Eclipses11 Solar Eclipse A total solar eclipse occurs about once every 18 months somewhere in the world. At any given location, a total solar eclipse occurs once every 360 years. – The next total solar eclipse in the U.S. is on Aug

Eclipses12 Path of Solar Eclipses

Eclipses13 Solar Eclipse Images

Eclipses14

Eclipses15

Eclipses16 Total Solar Eclipse

Eclipses17

Eclipses18

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Eclipses20 Total Solar Eclipse

Eclipses21 Diamond Ring Effect

Eclipses22 Bailey ’ s Beads

Eclipses23 Solar Corona During Eclipse

Eclipses24 Total Solar Eclipse As the Moon orbits the Earth, its apparent size varies. – Only when the Moon is closest to the Earth can it completely block the Sun. – If the Moon does not completely cover the Sun we get an annular eclipse.

Eclipses25 Annular Solar Eclipse

Eclipses26

Eclipses27

Eclipses28 Why not a solar eclipse every month then? Sun Ecliptic Moon Moon ’ s Orbit Earth 5o5o Moon's orbit is tilted about 5 o with respect to the Earth's orbit (ecliptic), so the shadows usually miss!

Eclipses29 Frequency of Solar Eclipses We do not get solar eclipses at every new moon because the orbit of the Moon is tilted by about 5 degrees with respect to the ecliptic. – At most new moons the Moon is either above or below the Sun. – The tilted orbit of the Moon crosses the ecliptic at two points. When the Sun approaches these points, eclipses are possible. This will happen twice a year.

Eclipses30  But, the Moon passes through the ecliptic twice a month.  *IF* at new moon – there is SOLAR ECLIPSE probability.

Eclipses31

Eclipses32

Eclipses33 Partial Solar Eclipse During a total solar eclipse, depending on your location during the event, you might only see part of the Sun’s face blocked because of your observing vantage point.

Eclipses34 Lunar Eclipses A lunar eclipse occurs when the Moon passes into the shadow of the Earth. The lunar eclipse is visible to everyone on the night side of the Earth. Aristotle ( B.C.) used the apparent shape of the Earth ’ s shadow to show that the Earth is a sphere.

Eclipses35 Line Up of Lunar Eclipse

Eclipses36 Lunar Eclipse

Eclipses37 Lunar Eclipse

Eclipses38 Lunar Eclipse Showing Earth ’ s Shadow

Eclipses39

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Eclipses41 The moon becomes a blood red color during a total lunar eclipse. No wonder that ancient cultures feared the appearance of the moon during a lunar eclipse.

Eclipses42 Lunar Eclipse Types Total Penumbral Eclipse Total Lunar Eclipse Partial Lunar Eclipse Partial Penumbral Eclipse

Eclipses43

Eclipses44 Earth ’ s Atmosphere Sunlight Moon Earth The Blood Moon The moon often does not totally disappear during a total lunar eclipse. Instead it can be seen as a very dark red color because of the refraction of sunlight through the Earth's atmosphere.

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