The Moon: Earth’s natural satellite. Expectations: D2. 1, D2. 5, D3 The Moon: Earth’s natural satellite. Expectations: D2.1, D2.5, D3.5 Watch phases of the moon http://www.youtube.com/watch?v=7vUObZwLJ8A&feature=related (1.5min)
Moon Orbit Moon orbits Earth every 27.3 days rotation = revolution which is why we only see one side of the moon The moon is held in orbit by gravity Image courtesy of NASA/JPL Ask students what they know about the moon before revealing bullet points
The Earth, Moon & Sun Moon Sun Earth Ask students if they know what gives us: 1. day and night 2. A year 3. Why we have a leap year (difficult) Reinforce: Earth orbits the Sun (1 year = 365.25 days --> leap year) “Click”: Moon orbits the Earth (27.3 days for one moon orbit of the Earth) “Click” for Animation: Earth spins around once every 24 hours (23.9 – gives day and night), whilst orbiting the Sun. Moon spins whilst orbiting the Earth (spins once every orbit i.e moon day and night takes 27.3 days) Earth
Lunar Phases When we see the Moon, we see the light from the Sun reflected off its surface The illuminated side does not always face Earth We see different amounts of the lit side of the Moon as it orbits the Earth (light always moves from right to left) Good activity for the playground. Students should represent: The rotation of the Earth The orbit of the Earth around the Sun The rotation of the Moon The orbit of the Moon around the Earth
Why does the moon not look the same every night? Different phases of the moon Image courtesy of the bbc (http://news.bbc.co.uk/1/hi/magazine/4311096.stm) Ask the students to draw some different shapes of the moon that they have seen. These different shapes are called phases.
Terminology for Moon Phases: Crescent – phases where the moon is less than half illuminated. Gibbous - phases where the moon is more than half illuminated. Waxing - "growing" or expanding in illumination Waning - "shrinking" or decreasing in illumination.
Phases in Motion
The Far Side of the Moon The full view of the far side of the moon is never visible from Earth The far side was first photographed by the Soviet Luna 3 orbiter in 1959
Waxing Gibbous
Waxing Crescent
Last Quarter
New Moon
Full Moon
Waning Crescent
Phases
Explanation of Moon Phases Watch this: http://www. youtube. com/watch Explanation of Moon Phases Watch this: http://www.youtube.com/watch?v=dOy5T6hRhpk&feature=related (4min)
Eclipses Occur when one celestial body blocks the view if another. Two types: Lunar Eclipses: occurs only with a full moon. Solar Eclipses: occur only with a new moon. Eclipses only happen when the sun, moon & earth are in a straight line.
Lunar Eclipse Earth is between the Sun and the Moon Total Eclipse - the entire moon passes through the Earth’s shadow Partial Eclipse - only part of the moon passes through the Earth’s shadow
Lunar Eclipse http://www.youtube.com/watch?v=wuhNZejHeBg (2min)
Solar Eclipse Moon is between the Sun and the Earth Only the Corona of the Sun is visible Solar & Lunar Eclipses http://www.youtube.com/watch?v=ilSkZQafybk&feature=fvwrel (2min)
Solar Eclipse
Solar Eclipse
Tides
Tides & Tidal Force Gravity of the moon and sun pull the Earth’s water toward them. This causes tides: The rising and falling of the surface of large bodies of water There are TWO high tides and TWO lows tides on Earth each day with approximately SIX hours between them .
Tide When the Sun & Moon are perpendicular the two gravitational pulls counteract each other this weakens the tides. When Sun and Moon are aligned then the effect on the tides is increased.
Homework Phases of the Moon worksheet. Eclipses worksheet. Read about Satellites Page 346-350 Page 351 #1-9