You will learn
- Define revolution.
- Explain the year and leap years.
- Distinguish rotation and revolution.
- Describe Earth’s orbit.
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
- Earth orbits the Sun in about 365.25 days.
- A leap year adds one day every four years.
- Earth moves at about 30 km/s in its orbit.
- Rotation is spinning; revolution is orbiting.
Words to know
one trip of a body around another
a year with an extra day, 366 days
the point in an orbit farthest from the Sun
the point in an orbit closest to the Sun
1. Discover: The extra day
Kofi was born on 29 February. “My birthday comes only every four years!” he laughs. Ms Sarpong explains, “Earth takes about 365 and a quarter days to orbit the Sun, so we add a day every fourth year to keep the calendar correct.”
Think: What would happen to the calendar if we never added it?
2. Understand: The year
Idea 1: Revolution
One revolution of Earth around the Sun takes about 365.25 days: a year. Earth travels about 940 million km each year at roughly 30 km/s.
Idea 2: Leap years
Because a year is about 365.25 days, we add one day to February every four years, a leap year of 366 days. Century years follow a special rule to stay accurate.
Idea 3: Orbit shape
Earth’s orbit is a slightly stretched ellipse. We are closest in early January (perihelion, about 147 million km) and farthest in early July (aphelion, about 152 million km).
3. Worked examples
Example 1 (I show you): Calculate
Leap days.
- 0.25 per year.
- 4 years.
- 1 day.
Answer: One day.
Example 2 (We do it together): Compare
Rotation and revolution.
- Spin.
- Orbit.
- 24 hours or 365 days.
Answer: Two motions.
Example 3 (You try): Explain
Distance.
Did you know?
Earth is closest to the Sun in January, yet January is winter in the northern hemisphere, so distance does not cause the seasons.
Why this matters
Our calendars, birthdays and farming all follow Earth’s journey around the Sun.
4. Explore: Orbit model
Walk once around a central lamp-sized marker while a partner counts steps, then scale the walk so each step is about one day.
- Place the marker.
- Choose a circle.
- Walk steps.
- Count.
Think about it: what did you notice?
What did you notice? One full circle matched one year.
5. Practise
Say it in a sentence
Use these starters when you talk about the lesson. Say them out loud.
- A ___ is one trip around the Sun.
- A ___ year has 366 days.
- ___ is the closest point to the Sun.
- ___ is the farthest point from the Sun.
Guided practice
Question 1. How long is a year?
365.25 days.
Question 2. What is a leap year?
366 days.
Question 3. Speed of Earth?
30 km/s.
Independent practice
Level 1: Start
- How long is a year?
- What is a leap year?
- Speed of Earth?
- Closest point?
- Farthest point?
Level 2: Grow
- Why leap years?
- Why not seasons?
- Why ellipse?
Level 3: Stretch
- Walk the orbit.
- Calculate.
- Explain.
Answers are in the answer key below. Try first, then check.
6. Apply: Science in everyday life
Explain why we need leap years.
Show a sample answer
Use 365.25.
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: January.
Fix: Different.
8. Lesson summary and revision card
- I can define revolution.
- I can explain the year and leap years.
- I can distinguish rotation and revolution.
- I can describe Earth’s orbit.
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
- Earth orbits the Sun in about 365.25 days.
- A leap year adds one day every four years.
- Earth moves at about 30 km/s in its orbit.
- Rotation is spinning; revolution is orbiting.
11. Next lesson
Next lesson: Day and night. 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.
- Define revolution and leap year. [2 marks]
- Explain leap years. [3 marks]
- Compare rotation and revolution. [3 marks]
- Safety rule. [2 marks]
Total: 10 marks.
Marking guide and model answers
- 1 each
- 0.25 day [1]; four years [1]; one extra day [1]
- Spin [1]; orbit [1]; times [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
- How long is a year?
- What is a leap year?
- Speed of Earth?
- Closest point?
- Farthest point?
- Why leap years?
- Why not seasons?
- Why ellipse?
- Walk the orbit.
- Calculate.
Homework
Find five people born on 29 February or ask why it is rare.
Answer key and marking scheme
| Question | Expected response | Marks |
|---|---|---|
| 1. How long is a year? | 365.25 days. | 1 |
| 2. What is a leap year? | 366 days. | 1 |
| 3. Speed of Earth? | 30 km/s. | 1 |
| 4. Closest point? | Perihelion. | 1 |
| 5. Farthest point? | Aphelion. | 1 |
| 6. Why leap years? | Extra quarter day. | 1 |
| 7. Why not seasons? | Tilt. | 1 |
| 8. Why ellipse? | Gravity. | 1 |
| 9. Walk the orbit. | Notes. | 1 |
| 10. Calculate. | Numbers. | 1 |
| Total | 10 |
Independent practice answers. Level 1: 1 365.25 days.; 2 366 days.; 3 30 km/s.; 4 Perihelion.; 5 Aphelion.. Level 2: 1 Extra quarter day.; 2 Tilt.; 3 Gravity.. Level 3: 1 Notes.; 2 Numbers.; 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 Define revolution | 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 the year and leap years | 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 Distinguish rotation and revolution | 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 Describe Earth’s orbit | 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: “Earth is closest to the Sun in summer.” January.
- Explain another way: use real objects, pictures or actions first, then words.
- Show a simpler example: Explain revolution.
- 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 studies Earth’s journey around the Sun. You do not need to be an expert to help.
- Mark the calendar.
- Ask “What is a leap year?”
- Stay safe outdoors.
- 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: define revolution; explain the year and leap years; distinguish rotation and revolution; describe Earth’s orbit.
Prerequisite knowledge. Grade 5 ideas: the Solar System, the Sun, Earth and Moon motions and models.
Materials. Cone, tape, chalk. 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. Mark a circle.
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). Ask, “Why is 29 February special?”
Explanation (10 min). Teach revolution.
Guided activity (10 min). Learners walk the model.
Independent activity (10 min). Learners calculate.
Assessment and reflection (5 min). Ask each learner to say one thing they learned and how they know it.
Key questions. How long is a year? Why leap years?
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. “Earth is closest to the Sun in summer.” January.
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 revolution. 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 6 Unit 9, topic 6; Next Generation Science Standards, Earth’s place in the universe; Cambridge Lower Secondary Science, Earth and space; IB Primary Years Programme, where we are in place and time. These sources informed the lesson.