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8th Grade Chapter 2 Lesson 4

8th Grade Chapter 2 Lesson 4



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For Student Use Only



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    8th Grade Chapter 2 Lesson 4 8th Grade Chapter 2 Lesson 4 Presentation Transcript

    • 8 th Grade Chapter 2 Lesson 4 Pgs. 79-84 For Student Use Only
    • Ecliptic and Climates
      • The sun follows the ecliptic path due to the Earth’s move.
        • Equinox= where the ecliptic sun crosses the celestial equator (2 points)
          • Vernal Equinox- In the Spring (March)
          • Autumnal Equinox- In the Autumn (between Summer and Winter)
    • Ecliptic and Climates
      • Solstices:
        • Solstice: a point on the ecliptic midway between the two equinoxes
          • Summer Solstice- the sun is 23 ½ degrees North of the celestial equator.
          • Winter Solstice- the sun is 23 ½ degrees south of the celestial equator
    • Ecliptic and Climates
      • Climate Zones
        • Torrid Zone: scorched zone- bounded on the North by the Tropic of Cancer and on the South by the Tropic of Capricorn
        • Frigid Zones: experience one day of complete darkness and complete daylight bounded by Artic Circle and Antarctic Circle
    • Ecliptic and Climates
      • Climatic Zones
        • Temperate Zones: Neither very hot or very cold, but sun is never straight overhead
        • Our Earth Wobbles:
          • The wobbling of the Earth is called precession of the equinox. The earth’s axis would take 26,000 years to complete wobble.
    • Ecliptic and Climates
      • Seasons:
        • Tilt of the Earth causes seasons
          • Kepler- 2 nd law of planetary motion says planets travel in elliptic orbits. Closer to the sun we travel faster.
          • The Northern Hemisphere and Southern Hemisphere have opposite seasons.
    • Ecliptic and Climates
      • Seasons
        • The sun can heat the Earth (Northern Hemisphere) better in July instead of in December
          • Summer more direct sunlight hits the earth
          • Winter the sun is less direct
    • Ecliptic and Climates
      • Making the months:
        • The month:
          • This is based on time between new moon and new moon.
          • The Gregorian calendar is the system we now use.
    • Ecliptic and Climates
      • Calendars:
        • Pope Gregory XIII established the new calendar; that we currently use.
        • Hindus, Arabs, and Hebrews all have their own calendars.
    • Ecliptic and Climates
      • Time:
        • Calendars:
          • Year- time it takes for the earth to revolve around the sun
            • Years have been divided into BC and AD
          • Week- not based on a heavenly body
            • God used the week in Creation, people need the day of rest.