1. Earth-Moon-Sun Relationship
Earthshine Project, BBSO (

2. Earth-Moon-Sun Relationship
Sphere – a round, three-dimensional object whose surface at all points is the same distance from its center
Axis – an imaginary line around which an object spins

3. Earth-Moon-Sun Relationship
Rotation – the spinning of an object around its axis
Revolution – the orbiting of one object around another, like Earth revolving around the sun
Ellipse – an elongated, closed curve; the shape of planetary orbits

4. Why do we have Seasons?
They are caused by the tilt of Earth’s axis, 23½0
Equinox – when the noon sun is directly overhead at the equator, equal hours of daylight and darkness
Solstice – when the noon sun is directly overhead at either 23½0N (Tropic of Cancer) or 23½0S (Tropic of Capricorn) latitude, coincides with the 1st day of summer or winter

6. Path of the Ecliptic
The apparent path of the Sun across the sky. In summer, the Sun's path is longest, and so are the days. In winter, the Sun's path is shortest, and so are the days.

7. The Moon 384,000km away, 1/6th the gravity of Earth
1. Earth’s only natural satellite
384,000km away, 1/6th the gravity of Earth
Noon temp. of 1300C, night temp. of -1750C
Surface features
Dark, flat plains called marias
Bright areas called highlands

8. The Moon (cont.)
The period of rotation equals the period of revolution around the Earth
Apollo 11 put Neil Armstrong and Edwin “Buzz” Aldrin on the moon on July 16th, 1969

10. The Moon (cont.)
Lunar Eclipse – when Earth passes between the moon and the sun

11. The Moon (cont.)
Solar Eclipse – when the moon passes between Earth and the sun

12. Earth-Moon Revolutions
The earth and moon revolving around the barycenter. Notice how the earth moves slightly.

13. Tides Caused by moon’s gravitational pull
Spring Tide – the moon, Earth and sun align
Neap Tide – when the moon, Earth and sun form a right angle

14. Moon Phases
Changes in appearance of the moon as it orbits Earth every 29½ days
New Moon – when the side facing Earth is totally dark
First Quarter Moon – when the right half of the moon facing Earth is lit
Full Moon – when the side facing Earth is completely lit
Third Quarter Moon – when the left half of the moon facing Earth is lit

17. Why do we NOT have a Lunar Eclipse every month?

20. Earth’s magnetic field
Basically a ‘magnet’, exerting a magnetic field surrounding the earth, which effectively extends several tens of thousands of kilometers into space, is called the magnetosphere.

21. Earth’s Magnetic Field
Magnetosphere protects us from the Solar Wind.

22. What is Solar Wind
A stream of energized, charged particles, primarily electrons and protons, flowing outward from the Sun
Travels through the solar system at speeds as high as km/s (and at a temperature of 1 million degrees (Celsius).
Made of plasma.

24. http://www. aerospaceweb. org/question/astronomy/magnetic-field/earth

25. BLUE MOON Extra Credit…. Go online and find:
The phase that the moon was on MY birthday – May 1st.
The phase of the moon on YOUR birthday
The month and year of the next
BLUE MOON