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ECLIPSES & TIDEShttp://safeshare.tv/w/KebKsedNAq
Chinese astrologers wrote of an eclipse occurring over 4000 years ago.
Historians and astronomers believe that this was an eclipse that happened on 22 October 2134 B.C.
Two astrologers at the time, Hsi and Ho, had apparently failed to predict this eclipse, and so were beheaded.
• Celestial bodies (planets, moons) are always “moving in front of each other.
• One celestial object casts a shadow on the other
• From Earth we see this as either a solar eclipse or a lunar eclipse
• Eclipses
http://safeshare.tv/w/KebKsedNAq
Solar Eclipses
http://www.youtube.com/watch?v=DSsrIThxeCI
• Solar Eclipse • Solar Eclipse occurs when the Moon blocks the light from the Sun and causes a shadow on a small area of the Earth
• Baileys Beads
• Diamond Ring
Viewing a Solar Eclipse
How We See
Eclipse shadowsWhen the light passes through gaps between leaves of a tree, the shadows on the ground show little copies of the eclipse going on in the sky. In this eclipse, the moon did not quite cover all of the Sun, so you seen white rings. C
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http://eclipse.gsfc.nasa.gov/SEgoogle/SEgoogle2001/SE2017Aug21Tgoogle.html
Umbra
Path of totality
Eclipse of 2017
Lunar eclipses
http://www.youtube.com/watch?v=wuhNZejHeBg
Lunar eclipse
• Lunar eclipse• Lunar Eclipse• Moon passes through Earth's shadow• Occurs during Full Moon phase
Credit and Copyright: Andy Steere
Fun Eclipse Facts
• The moon’s shadow moves at 1700 km/hour (1,048 mi/hr) .
• Maximum totality is ~7 ½ minutes.• Every place on Earth will see a total solar eclipse once
every 400 years.• Solar Eclipses occur more frequently than lunar eclipses
( by 5:3).• There must be at least two solar eclipses every year.• There can be two solar eclipses in back to back months
with a total lunar eclipse in between.• This triple eclipse will occur twice during an eclipse year
(1935, 2160).• Seven eclipses is the maximum - 4 solar, 3 lunar (1982,
2485).
• TIDES • TIDES- the regular rise and fall of the Earth’s oceans due to the gravitational pull of the moon
http://www.youtube.com/watch?v=rRPtNAA-9UE
Spring tides occur at Full and New Moons
Draw this diagram
• Spring tide • Spring tides – occur during the new and full moon phases
• The direct line of the Sun and moon cause additional gravitational pull (like a tug of war – in a straight line)
• Neap Tide • Neap tides – occur at the quarter moon phases
• Tides are lower
Neap Tides occur at quarter Moons
Draw this diagram
Resources
Paper Plate Astronomy http://analyzer.depaul.edu/paperplate/
Solar Events http://solarevents.org
Eclipseshttp://sunearth.gsfc.nasa.gov/eclipse/eclipse.html
Earth Moon Viewer http://www.fourmilab.ch/earthview/vplanet.html
Lunar Posn Calculator http://www.fourmilab.ch/earthview/pacalc.html
Lunar Phases, etc.http://www.lkwdpl.org/schools/elempath/heavenlymotion/