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eclipses

Published on Nov 24, 2015

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PRESENTATION OUTLINE

eclipses and tides

by Elizabeth Sloane

eclipses

Photo by redtim

Eclipses

  • A solar eclipse occurs when the moon gets between the earth and the sun
  • The moon casts a shadow over the earth
  • A solar eclipse can only take place during the moon phase of the new moon
  • There are 2 different types of eclipses- solar eclipses and lunar eclipses
Photo by davedehetre

Solar eclipse

  • It occurs during the new moon phase
  • It is when the moon passes directly between the Sun and the Earth
  • It's shadow falls upon earths surface

LuNAR ECLIPSE

  • It occurs when the moon passes directly behind Earth into it's shadow (umbra)
  • This occurs when the Earth and Moon are aligned (in syzygy)
  • A lunar eclipse can only occur during a full moon

FUN FACTS ABOUT ECLIPSES

  • Lunar eclipses can occur up to 3 times a year
  • They usually alternate going by: Lunar, solar, lunar
  • The maximum time a lunar eclipse can last is 3hrs & 40min
  • The maximum time a solar eclipse can last is 7min & 40sec
  • Lunar eclipses are visible over an entire hemisphere
  • Solar eclipses are visible over a narrow path & a maximum of 167 miles wide
Photo by Dylan Parker

TIDES

Photo by Luton

tIDES

  • They are the rise and fall of sea levels
  • They are caused by the combination of gravitational forces exterted by the moon,sun, and rotation of the earth
  • There are 2 different types of tides: Spring tides & Neap tides
Photo by tomasz.cc

Spring tides

  • They are especially strong tides
  • Contrary to their name they have nothing to do with the season of spring
  • They occur when the Earth, Sun, and Moon are in a line
  • The gravitational forces of the Moon and the Sun both help the tides
  • They occur during both the Full moon & the New moon
Photo by jacilluch

Neap tides

  • This is a tide just after the first and third quarters of the moon
  • During this time there is a small difference between high and low waters
Photo by HighTechDad

Fun facts about tides

  • The type of gravitational force that causes tides are known as tractive forces
  • The highest tides in the world are recorded in Canada
  • Offshore the difference in tides are usually less than 1.6ft.
  • The suns gravity also produces tides but the strength is greatly reduced
  • Spring and Neap tides are about 20% higher or lower than average

The end

Photo by viking_79