P7.1
- 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
- Lunar Eclipse
- They do not happen very often
- The phases of the moon
- 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
- The Pole Star
- 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
- The postions of stars are measured by angles seen from earth
- Eclipses and the Moon
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