Moon phases diagram with labeling exercise and true/false questions.

Let's solve the worksheet step by step.

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Q.1: Label the moon phases on the diagram below

We are given a circular diagram showing the Moon’s orbit around Earth, with 8 positions of the Moon at different phases. The phases to label are:

- Waning gibbous
- Full moon
- Waxing gibbous
- New moon
- First quarter
- Waning crescent
- Third quarter
- Waxing crescent

We need to correctly place these labels based on the position of the illuminated part of the Moon as seen from Earth.

#### Understanding Moon Phases:
The Moon goes through phases due to its position relative to the Earth and Sun. As it orbits Earth, we see different portions of the illuminated side.

- New Moon: Moon is between Earth and Sun → we see no light (dark side facing us).
- Waxing Crescent: Small sliver visible, growing.
- First Quarter: Half illuminated (right side in Northern Hemisphere).
- Waxing Gibbous: More than half lit, increasing.
- Full Moon: Entire face illuminated (opposite Sun).
- Waning Gibbous: Decreasing, more than half lit.
- Third Quarter: Half lit, left side illuminated.
- Waning Crescent: Small sliver, decreasing.

Note: "Waxing" means growing; "Waning" means shrinking.

Now let’s analyze the diagram (clockwise or counterclockwise? Usually shown clockwise).

Assuming the diagram shows the Moon orbiting counterclockwise (standard in astronomy), starting from the top and moving clockwise around Earth.

But looking at the arrows, they go clockwise around Earth. So we’ll follow the direction of the arrows.

Let’s number the positions clockwise, starting from the top:

1. Top – Moon is half-lit, right side dark → This is First Quarter (illuminated side on the right).
2. Top-right – Mostly lit, but not full → Waxing Gibbous
3. Right – Fully lit → Full Moon
4. Bottom-right – Half lit, left side dark → Third Quarter
5. Bottom – Mostly dark, small lit sliver on right → Waning Crescent
6. Bottom-left – Half lit, left side illuminated → Waning Gibbous
7. Left – Almost fully dark → New Moon (we can’t see any light)
8. Top-left – Small lit sliver on left → Waxing Crescent

Wait — this doesn't match the typical sequence.

Let’s double-check the phase order:

Correct sequence (as Moon moves around Earth):

Starting from New Moon → Waxing Crescent → First Quarter → Waxing Gibbous → Full Moon → Waning Gibbous → Third Quarter → Waning Crescent → back to New Moon.

So if the arrows show the Moon moving clockwise, then we start from the top and go clockwise.

Let’s assume the top position is New Moon.

But wait — in the diagram, the top Moon has half illuminated, so it cannot be New Moon.

Let’s look carefully.

Actually, the Moon at the top has left half lit, right half dark → that’s Third Quarter?

No — let’s think about lighting.

The Sun is off to the right (since Earth is in the center, and Sun illuminates from the right). So the right side of the Moon should be lit when it’s on the right side of Earth.

So:

- When Moon is on the right of Earth → Sun is behind it → entire face lit → Full Moon
- When Moon is on the left of Earth → Sun is behind Earth → Moon’s dark side faces us → New Moon
- When Moon is above Earth → Sun is to the right → right side of Moon is lit → First Quarter?
Wait — no.

Let’s use standard convention:

- The Sun is to the right (outside the diagram).
- So sunlight comes from the right.

Then:

- When Moon is on the right side of Earth → Sun is behind it → whole face illuminated → Full Moon
- When Moon is on the left side of Earth → Sun is behind Earth → we see the dark side → New Moon
- When Moon is above Earth → Sun is to the right → right half of Moon is lit → so right side illuminated → this is First Quarter (if moving clockwise)
- But First Quarter is when the Moon is halfway between New and Full, and the right side is lit (in northern hemisphere) → yes.

Let’s assign each position:

Label the positions clockwise, starting from the top:

1. Top – Moon: left half dark, right half lit → Right side illuminated → this is First Quarter (after New Moon, before Full)
2. Top-right – Mostly lit, right side → Waxing Gibbous
3. Right – Fully lit → Full Moon
4. Bottom-right – Left side lit, right side dark → Waning Gibbous (after Full, decreasing)
5. Bottom – Half lit, left side → Third Quarter
6. Bottom-left – Left side mostly lit, but small sliver on right → Waning Crescent? Wait — no.

Wait — confusion arises.

Let’s do it properly.

Standard Moon phase sequence (clockwise):

1. New Moon – Moon between Earth and Sun → no light visible → left side of diagram (Moon on left of Earth) → Dark
2. Waxing Crescent – small lit sliver on the right side → just after New Moon → Moon near left
3. First Quarter – right half lit → Moon at top
4. Waxing Gibbous – most of right side lit → Moon at top-right
5. Full Moon – all lit → Moon at right
6. Waning Gibbous – left side lit, decreasing → Moon at bottom-right
7. Third Quarter – left half lit → Moon at bottom
8. Waning Crescent – small sliver on the left side → Moon at bottom-left

But in the diagram, the arrows go clockwise, and the positions are labeled with blanks.

Let’s identify each Moon:

- Top: Half moon, right side lit → First Quarter
- Top-right: Mostly lit, right side → Waxing Gibbous
- Right: Full → Full Moon
- Bottom-right: Half lit, left side lit → Third Quarter
- Bottom: Half lit, left side lit → same as above? No — wait, bottom one has left side lit, but the bottom-right also has left side lit?

Wait — let’s look at the diagram:

From the image:

- Top: Half moon, right side lit → First Quarter
- Top-right: Most of moon lit, right side → Waxing Gibbous
- Right: Full moon → Full Moon
- Bottom-right: Half moon, left side lit → Third Quarter
- Bottom: Half moon, left side lit → wait, same as above? No — bottom one is left side lit, but bottom-left is next.

Wait — actually, the positions are:

1. Top: Half lit, right side → First Quarter
2. Top-right: Mostly lit, right side → Waxing Gibbous
3. Right: Full → Full Moon
4. Bottom-right: Half lit, left side lit → Third Quarter
5. Bottom: Half lit, left side lit → wait, this is same as third quarter?

No — bottom one has left side lit, but bottom-left is next.

Wait — let’s list them in order clockwise:

Start from top, then move clockwise:

1. Top – Moon: right half lit → First Quarter
2. Top-right – Moon: mostly lit, right side → Waxing Gibbous
3. Right – Full → Full Moon
4. Bottom-right – Moon: left half lit → Third Quarter
5. Bottom – Moon: left half lit → same as above? No — bottom has left half lit, but bottom-left has small sliver on left → waning crescent?

Wait — let’s look at the illumination:

- Bottom: Moon has left half lit, right half dark → Third Quarter
- Bottom-left: Moon has small sliver on left → Waning Crescent
- Left: Moon has no light → New Moon
- Top-left: Moon has small sliver on right → Waxing Crescent

Ah! Now it makes sense.

So going clockwise:

1. Top – First Quarter (right half lit)
2. Top-right – Waxing Gibbous (mostly lit, right side)
3. Right – Full Moon
4. Bottom-right – Waning Gibbous (left side lit, mostly lit)
5. Bottom – Third Quarter (left half lit)
6. Bottom-left – Waning Crescent (small sliver on left)
7. Left – New Moon (no light)
8. Top-left – Waxing Crescent (small sliver on right)

Yes!

So now, labeling the blanks:

The diagram has 8 blank boxes around the circle.

Assuming the blanks are in the same order as the moons:

Let’s label them clockwise, starting from the top:

1. Top – First Quarter
2. Top-right – Waxing Gibbous
3. Right – Full Moon
4. Bottom-right – Waning Gibbous
5. Bottom – Third Quarter
6. Bottom-left – Waning Crescent
7. Left – New Moon
8. Top-left – Waxing Crescent

But wait — the New Moon is at the left, which is correct — Moon is between Earth and Sun.

And Waxing Crescent is just after New Moon, so top-left (small sliver on right) → yes.

So final labels:

- Top: First quarter
- Top-right: Waxing gibbous
- Right: Full moon
- Bottom-right: Waning gibbous
- Bottom: Third quarter
- Bottom-left: Waning crescent
- Left: New moon
- Top-left: Waxing crescent

✔ Correct.

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Q.2: True or False

1. The moon makes one complete revolution around the Earth every year.
✘ False
The Moon revolves around Earth approximately every 27.3 days (sidereal month), not once a year.
→ F

2. Moon revolves around Earth, Earth revolves around Sun.
✔ True
The Moon orbits Earth, and Earth orbits the Sun.
→ T

3. There are six phases of the moon.
✘ False
There are eight main phases: New Moon, Waxing Crescent, First Quarter, Waxing Gibbous, Full Moon, Waning Gibbous, Third Quarter, Waning Crescent.
→ F

4. The moon does not produce its own light.
✔ True
The Moon reflects sunlight. It does not generate its own light.
→ T

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✔ Final Answers:

#### Q.1 Labels (clockwise from top):

- Top: First quarter
- Top-right: Waxing gibbous
- Right: Full moon
- Bottom-right: Waning gibbous
- Bottom: Third quarter
- Bottom-left: Waning crescent
- Left: New moon
- Top-left: Waxing crescent

#### Q.2 True/False:

1. F
2. T
3. F
4. T

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