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  • Created by: amy_mair
  • Created on: 22-06-16 16:00
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  • P7.1
    • Eclipses and the Moon
      • The phases of the moon
        • 1. The moon does not glow itself- it only reflects light from the sun. Only the half facing the sun is lit up, leaving the other half in the shadow
        • 2. As the moon orbits the earth, we see different amount of the moons dark and lit-up surfaces
        • 3. You see a full moon when the whole of the lit-up surface is facing the earth, and a new moon the dark half faces us
        • 4. The rest of the phases are in between thesee 2 extremes
      • Eclipses
        • Lunar Eclipse
          • As it orbits, the moon sometimes passes into the earths shadow.
          • The earth blocks sunlight from the moon, so almost no light is reflected from the moon and it just seems to disappear
          • A total lunar eclipse is where no direct sunlight can reach the moon. More often, the moon is not fully in the earths shadow so only park of it appears dark- a partial lunar eclipse
        • Solar Eclipse
          • The moon is just the right size and distance away that when it passes between the sun and the earth it can block out the sun
          • This is called a solar eclipse. From some parts of the earth the sun is completely blocked- a total solar eclipse.
          • From many places on earth the sun will not be blocked at all
      • They do not happen very often
    • Coordinates in Astronomy
      • The postions of stars are measured by angles seen from earth
        • 1. The positions of stars are measured by angles seen from earth
        • It is just like latitude and lonitude on earth
        • 2. The sky appears to turn as the earth spins- so astronomers picked two fixed positions to measure from
          • The Pole Star
            • The star that does not appear to move because it is almost directly above the north pole
          • The celestial equator
            • Is an imaginary plane running across the sky, which extends out from the earths equator
        • 3. The two angles used to measure positions in the sky are
          • Declination: Celestial latitude whihc is measured in degrees
          • Right Ascension: Celestial longitude measured in degrees or time
      • Movement
        • 1. All the planets in the solar system orbit the sun in the same direction but at different speeds
        • 2. Even without a telescope, you can often see the naked eye
        • 3. Every so often planets seem to change direction and go the other way for a bit
        • 4. We are seeing the motion of planet relative to the earth
        • 5. Slower moving planets further out change direction less frequently


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