phases of the_moon
DESCRIPTION
To Infinity and Beyond The Phases of the Mooon Year 7 ScienceTRANSCRIPT
Phases of the moon
LEARNING INTENTION•To become familiar with the phases of the moon•To understand how and why they appear
SUCCESS CRITERIA
•I understand how and why the phases of the moon occur•I know the 8 phases of the moon
Why does the moon appear to change shape?
The moon orbits the earth. It takes 28 days for the moon to go around the
earth once
The only reason we can see the moon is because it reflects the light from the
sun
Only one half of the moon is ever lit
As the moon travels around the earth we see
different amounts of the lit side of the moon
Day 1 - New moon
The dark side of the moon is facing the earth
New moon
The dark side of the moon is facing the earth
Day 4 – Waxing Crescent
Waxing Crescent
We begin to see part of the side of the moon that is lit up
Day 7 – First quarter
First Quarter
Confused!? It’s obviously a half moon but is called a quarter moon because it has
gone quarter of the way around the earth
Day 10 – Waxing Gibbous
Waxing Gibbous
The moon is now in a position where we can see most of the side that is lit
up
Day 14 – Full moon
Full moon
The moon is pretty much opposite the sun now and so we can see all of the
part that is lit up
Day 18 – Waning Gibbous
Waning Gibbous
The moon is now in a position where we can see most of the lit side of the
moon
Day 21 – Last quarter
Last Quarter
The moon is in the last quarter of it’s way around the earth
Day 24 – Waning Crescent
Waning Crescent
We are starting to lose sight of the side of the moon that is lit up
Day 28 - New moon
The dark side of the moon is facing the earth again
The Phases of the Moon
The dotted lines represent our line of sight from Earth
New MoonThe New Moon occurs when the moon is positioned between the earth and sun. The three objects are in approximate alignment. The entire illuminated portion of the moon is on the back side of the moon, the half that we cannot see.
After the new moon, the sunlit portion is increasing, but less than half, so it is a WAXING CRESCENT
Waxing Crescent
Waxing Crescent
Waxing Crescent
Half Moon Waxing
The first quarter and third quarter moons (both often called a "half moon"), happen when the moon is at a 90 degree angle with respect to the earth and sun. So we are seeing exactly half of the moon illuminated and half in shadow.
Waxing GibbousAfter the first quarter, the sunlit portion is still increasing, but now it is more than half, so it is waxing gibbous
Waxing Gibbous
Waxing Gibbous
Waxing Gibbous
Full Moon
At a full moon, the earth, moon, and sun are in approximate alignment, just as the new moon, but the moon is on the opposite side of the earth, so the entire sunlit part of the moon is facing us. The shadowed portion is entirely hidden from view.
Half Moon Waning
The first quarter and third quarter moons (both often called a "half moon"), happen when the moon is at a 90 degree angle with respect to the earth and sun. So we are seeing exactly half of the moon illuminated and half in shadow.
Waning Gibbous
Waning Gibbous
Waning Gibbous
Waning Gibbous
Waning GibbousAfter the full moon (maximum illumination), the light continually decreases. So the waning gibbous phase occurs next.
Waning Crescent
Waning Crescent
Waning Crescent
Waning CrescentFollowing the third quarter is the waning crescent, which wanes until the light is completely gone
New Moonthe new moon occurs when the moon is positioned between the earth and sun. The three objects are in approximate alignment. The entire illuminated portion of the moon is on the back side of the moon, the half that we cannot see.
Modelling the phases of the moon
You will need: polystyrene ball, lamp and a retort standWorking in groups of 3 –
1. One person acts as the earth and the other holds the ball (moon) and the other holds the lamp (sun).
2. Darken the room and aim the lamp (sun) at the ball (moon). The student holding the moon walks around the earth in an anticlockwise direction, holding the same side towards the earth.
3. Try to identify each of the 8 phases of the moon as they are seen by the person representing the earth.
4. Stop rotating briefly when each of the phases is identified so that the positions of the sun, earth an moon can be recorded on your worksheet.
Make your own Phases of the Moon Flip Book
Review1. How many phases does the moon have? 2. What side of the moon do we see first? 3. What is it called when the moon appears to grow? 4. What is it called when the moon appears to get smaller? 5. How many days does it take the moon to complete a cycle? 6. Name the eight phases of the moon? 7. What is it called when you see more light in the moon (greater than
semicircle and less than a circle)? 8. What is it called when you see less light in the moon9. What is a natural body that revolves around a planet
10. One of the shapes the moon seems to have as it orbits Earth. 11. How long does it take the earth to make one full turn on it's axis? 12. How long does the Earth's orbit take?
Answers1. eight 2. dark side 3. waxing 4. wane 5. 29 1/2 days or 1 month 6. new moon, waxing crescent, first quarter, waxing gibbous, full moon, waning
gibbous, last quarter, waning crescent 7. gibbous
8. Crescent 9. Moon 10. Phase 11. 24 Hours 12. 365 days