You will learn
- Name phases.
- Explain why phases happen.
- Order the cycle.
- Model with a lamp and ball.
Version 0.2 · expanded edition · built from cited public sources Content is based on the official frameworks and sources listed under Sources and standards. No official endorsement is claimed. Written in the style of common primary school assessments. No exam result is promised.
Student lesson
Words to know
how much of the lit Moon we see
getting bigger
getting smaller
about 29.5 days
1. Discover: The changing Moon
Esi draws the Moon each night for two weeks. First a thin crescent, then a half circle, then a full circle. “The Moon is not changing shape,” her teacher says. “We are seeing different parts of its lit half.”
Think: What would the Moon look like if the Sun were behind it?
2. Understand: Phases
Idea 1: Half lit
The Sun always lights half the Moon. As the Moon orbits Earth, we see more or less of that lit half.
Idea 2: Eight phases
New Moon, waxing crescent, first quarter, waxing gibbous, full Moon, waning gibbous, last quarter, waning crescent. Waxing grows; waning shrinks.
Idea 3: Not Earth’s shadow
Phases are not caused by Earth’s shadow. A lunar eclipse is a rarer event when Earth blocks sunlight from the Moon.
3. Worked examples
Example 1 (I show you): Order
Phases.
- New.
- Crescent.
- Full.
Answer: New, crescent, quarter, gibbous, full.
Example 2 (We do it together): Explain
Full Moon.
- Opposite Sun.
- Whole lit side.
- Visible.
Answer: We see the whole lit half.
Example 3 (You try): Explain
New Moon.
Show the steps and answer
- Between Earth and Sun.
- Dark side.
- Hidden.
Answer: We see the unlit side.
Did you know?
The time from one full Moon to the next is 29.5 days, and many calendars including the Islamic calendar are based on it.
Why this matters
Moon phases guide calendars and festivals.
4. Explore: Phase model
In a dark room, hold a ball and circle your body while a lamp lights from one side, and record the lit part you see.
- Place lamp on one side.
- Hold the ball.
- Turn slowly.
- Draw the phases.
Think about it: what did you notice?
What did you notice? The lit part changed as I turned.
5. Practise
Say it in a sentence
Use these starters when you talk about the lesson. Say them out loud.
- A ___ is how much of the lit Moon we see.
- ___ means getting bigger.
- ___ means getting smaller.
- A lunar ___ is about 29.5 days.
Guided practice
Question 1. What is a phase?
View of the Moon.
Question 2. What is waxing?
Growing.
Question 3. What is waning?
Shrinking.
Independent practice
Level 1: Start
- What is a phase?
- What is waxing?
- What is waning?
- How long is a cycle?
- What is a new Moon?
Level 2: Grow
- Why phases?
- Why not shadow?
- Why dark new Moon?
Level 3: Stretch
- Run the model.
- Draw eight phases.
- Explain.
Answers are in the answer key below. Try first, then check.
6. Apply: Science in everyday life
Explain why we see a full Moon.
Show a sample answer
Use positions.
Another one. Tell a family member one thing from this lesson. Use the words you learned.
Show a sample answer
A clear sentence that uses at least one word from Words to know.
7. Common mistakes
Fix: Different view.
Fix: We see parts.
8. Lesson summary and revision card
- I can name phases.
- I can explain why phases happen.
- I can order the cycle.
- I can model with a lamp and ball.
9. Check and master
Answer all 14 questions. You will see feedback after each one.
Your result appears here after you answer every question.
10. Key takeaways
- The Sun always lights half the Moon.
- We see different amounts as it orbits.
- The cycle takes about 29.5 days.
- Eclipses are different from phases.
11. Next lesson
Next lesson: Gravity in the Solar System. Keep going with the next idea in this course.
Exam practice
These questions are written in the style of common school and international primary assessments. Try them on your own, without looking back. Then check your answers in the marking guide. The marks are shown in brackets.
- Name six phases. [3 marks]
- Explain why phases happen. [3 marks]
- Contrast phases and eclipses. [2 marks]
- Safety rule. [2 marks]
Total: 10 marks.
Marking guide and model answers
- Two correct per mark [3 marks for six]
- Half lit [1]; orbit [1]; changing view [1]
- Phases view [1]; eclipses shadow [1]
- Any [1]; reason [1]
Score guide: 9 to 10 = secure. 6 to 8 = nearly there, revise the parts you missed. Under 6 = work through the lesson again with a grown-up.
Printable worksheet
- What is a phase?
- What is waxing?
- What is waning?
- How long is a cycle?
- What is a new Moon?
- Why phases?
- Why not shadow?
- Why dark new Moon?
- Run the model.
- Draw eight phases.
Homework
Draw the Moon for five nights.
Answer key and marking scheme
| Question | Expected response | Marks |
|---|---|---|
| 1. What is a phase? | View of the Moon. | 1 |
| 2. What is waxing? | Growing. | 1 |
| 3. What is waning? | Shrinking. | 1 |
| 4. How long is a cycle? | 29.5 days. | 1 |
| 5. What is a new Moon? | Dark. | 1 |
| 6. Why phases? | Changing view. | 1 |
| 7. Why not shadow? | Different cause. | 1 |
| 8. Why dark new Moon? | Unlit side. | 1 |
| 9. Run the model. | Diagram. | 1 |
| 10. Draw eight phases. | Chart. | 1 |
| Total | 10 |
Independent practice answers. Level 1: 1 View of the Moon.; 2 Growing.; 3 Shrinking.; 4 29.5 days.; 5 Dark.. Level 2: 1 Changing view.; 2 Different cause.; 3 Unlit side.. Level 3: 1 Diagram.; 2 Chart.; 3 Sentence..
Quiz answers: 1 B, 2 C, 3 A, 4 B, 5 C, 6 A, 7 B, 8 C, 9 A, 10 B, 11 C, 12 A, Challenge 1 B, Challenge 2 C.
Mastery and remediation
| Objective | Bronze (Developing) | Silver (Proficient) | Gold (Advanced) |
|---|---|---|---|
| O1 Name phases | Shows this with help from an adult or a picture | Does this independently and explains how they know | Explains it clearly and uses it in a new situation |
| O2 Explain why phases happen | Shows this with help from an adult or a picture | Does this independently and explains how they know | Explains it clearly and uses it in a new situation |
| O3 Order the cycle | Shows this with help from an adult or a picture | Does this independently and explains how they know | Explains it clearly and uses it in a new situation |
| O4 Model with a lamp and ball | Shows this with help from an adult or a picture | Does this independently and explains how they know | Explains it clearly and uses it in a new situation |
Courseversity badge thresholds (overall quiz score): Gold = 90–100%; Silver = 80–89.9%; Bronze = 70–79.9%. A badge is never a full record of progress.
If a learner struggles
- Find the misconception: “Phases are Earth’s shadow.” Different view.
- Explain another way: use real objects, pictures or actions first, then words.
- Show a simpler example: Explain Moon phases.
- Guided practice: work through one example together and let the learner try the next one.
- Reassess: use the quiz again or the worksheet.
- Move on when the learner shows Silver-level evidence independently.
For parents and guardians
In this lesson your child models Moon phases. You do not need to be an expert to help.
- Watch the Moon.
- Ask “What shape tonight?”
- Safe lamp use.
- Ask “how do you know?” after each answer, and listen.
- Praise effort, not only right answers. Mistakes are how we learn.
- Ten to fifteen minutes a day is better than one long session.
Teacher package
1–5. Objectives, prerequisites, materials, preparation, duration
Lesson objectives. Learners will: name phases; explain why phases happen; order the cycle; model with a lamp and ball.
Prerequisite knowledge. Grade 4 ideas: the Earth, Sun and Moon, day and night, shadows and the seasons.
Materials. Ball, lamp, notebook. Low-resource options: use chalk or charcoal on a board or wall, drawings in the sand, and objects from the classroom instead of printed materials.
Preparation. Darken the room.
Suggested duration. 45–60 minutes. It can be split into two shorter sessions.
6–9. Teaching procedure, explanation notes, guided and independent activities
Introduction (5 min). Hold up a ball and ask, “Why is half bright?”
Explanation (10 min). Teach phases.
Guided activity (10 min). Learners model.
Independent activity (10 min). Learners draw.
Assessment and reflection (5 min). Ask each learner to say one thing they learned and how they know it.
Key questions. Waxing or waning? Which phase?
Teacher explanation notes. Start with real objects and safe, hands-on observation. Then talk about what was seen, then draw and write. Always say “how do you know?”. Keep to the safety notes, and use local, safe materials.
10–12. Differentiation, formative assessment, common misconceptions
Support. Use real objects and pictures, short sentences and a partner. Let learners point, show or draw instead of writing. Extension. Ask learners to find a new example at home and explain how they know.
Formative assessment. Listen to learners read and explain, ask “how do you know?”, and check the independent work.
Misconceptions. “Phases are Earth’s shadow.” Different view.
13–15. Assessment questions, answer keys, marking scheme
Use the quiz, the 10-mark exam practice and the worksheet on this page. All answers and marking guides are in the answer sections above. Re-check every answer before use.
16–19. Remediation, enrichment, homework, teacher reflection
Remediation. Explain Moon phases. Enrichment. Look for one new example near your home or school, draw it and explain it to someone. Homework. See above.
Teacher reflection. After teaching, record: which ideas learners understood; which misconceptions occurred; which activities worked; which learners need more practice; and what to improve next time.
Sources and standards
This lesson is based on the sources below, and no official endorsement is claimed. Reference starting points: Next Generation Science Standards, Cambridge Primary Science and the IB Primary Years Programme. Where a standard code is named, it points to the official framework.
Research used to shape this lesson. Courseversity Science curriculum, Grade 5 Unit 9, topic 8; Next Generation Science Standards, Earth’s place in the universe; Cambridge Primary Science Stage 5, Earth and space; IB Primary Years Programme, where we are in place and time. These sources informed the lesson.