Science · Year 2 · Our Changing World · Summer Term

Day and Night: Earth's Rotation

Understanding the concept of day and night and how it relates to the Earth's rotation.

• National Curriculum Attainment Targets
• KS1: Science - Seasonal Changes

About This Topic

Day and night occur because Earth rotates on its axis once every 24 hours. The half facing the Sun has daylight, while the other half faces away into night. Year 2 students connect this to everyday observations, such as shadows lengthening in the afternoon or the Sun appearing to move across the sky. They address key questions like explaining day and night, predicting outcomes if Earth stopped spinning, and building models to show rotation.

This topic fits KS1 Science standards on seasonal changes within the 'Our Changing World' unit. It lays groundwork for understanding Earth-Sun relationships, time zones, and seasons. Students practice scientific skills: observing patterns in shadows, making predictions about constant day or night on a non-rotating Earth, and communicating ideas through labelled diagrams.

Active learning suits this topic well. Students manipulate globes with torches to mimic rotation, or track stick shadows outside over hours. These methods make the invisible axis tilt and spin concrete, help dispel Sun-centred views, and encourage peer explanations that solidify understanding.

Key Questions

1. Explain why we have day and night.
2. Predict what would happen if the Earth stopped spinning.
3. Construct a model to demonstrate day and night.

Learning Objectives

• Explain how the Earth's rotation causes day and night.
• Identify the part of the Earth experiencing day and the part experiencing night at any given moment.
• Construct a model that demonstrates the Earth's rotation and its effect on day and night.
• Predict the observable consequences if the Earth were to stop rotating.

Before You Start

Observing the Sun and Shadows

Why: Students need to have observed how shadows change throughout the day to connect this to the Sun's apparent movement and the Earth's rotation.

Basic understanding of the Sun as a light source

Why: Students must know that the Sun provides light for children to understand how one side of the Earth can be lit while the other is dark.

Key Vocabulary

Rotation	The spinning of the Earth on its own axis. This movement takes 24 hours to complete.
Axis	An imaginary line that runs through the Earth from the North Pole to the South Pole. The Earth spins around this line.
Day	The period when a part of the Earth faces the Sun and receives light. This is when it is light outside.
Night	The period when a part of the Earth faces away from the Sun and does not receive light. This is when it is dark outside.
Sunlight	The light that comes from the Sun. It illuminates the side of the Earth that is facing it.

Watch Out for These Misconceptions

Common Misconception

The Sun moves around the Earth to cause day and night.

What to Teach Instead

Earth's rotation creates day and night, not Sun movement. Globe-torch models let students see the Sun stay fixed while Earth turns, prompting them to revise drawings. Group discussions reveal shared errors and build consensus on evidence.

Common Misconception

Day and night happen because Earth orbits the Sun.

What to Teach Instead

Orbiting causes seasons over a year, but rotation drives daily cycles. Shadow tracking activities show 24-hour patterns matching spin speed. Peer teaching in pairs helps students distinguish spin from orbit through repeated trials.

Common Misconception

Everyone in the world has day or night at the same time.

What to Teach Instead

Rotation means opposite sides experience opposite times. Class globe rotations with student 'cities' marked clarify global differences. Collaborative predictions about friends abroad strengthen relational thinking.

Active Learning Ideas

Demonstration: Globe and Torch Model

Use a globe or ball as Earth and a torch as the Sun. Hold the globe upright and rotate it slowly while students observe day and night on different sides. Have them predict shadow positions before each turn, then label a worksheet with findings.

20 min·Whole Class

Small Groups: Shadow Stick Stations

Place sticks in playdough at four outdoor spots. Groups measure and record shadow lengths and directions hourly for a morning. Back in class, they plot changes on circle templates to reveal rotation patterns.

45 min·Small Groups

Pairs: What If Earth Stopped?

Pairs draw Earth halves: one always lit, one always dark. Discuss effects on plants, sleep, temperature using prompt cards. Share predictions in a whole-class vote and refine based on evidence from models.

30 min·Pairs

Individual: Personal Day Chart

Students draw a daily timeline showing their activities in day and night zones. Add arrows for Earth's spin and labels for Sun position. Display charts to compare family routines across time zones.

25 min·Individual

Real-World Connections

• Astronauts on the International Space Station experience multiple sunrises and sunsets every 24 hours due to the station's orbit and the Earth's rotation. This affects their sleep schedules and daily routines.
• Farmers in different parts of the world rely on predictable day and night cycles for planting and harvesting crops. For example, crops that need full sun will be planted in areas with longer daylight hours during their growing season.
• People who work night shifts, such as nurses or bakers, adjust their lives to the cycle of day and night. Their work is essential for society to function around the clock.

Assessment Ideas

Exit Ticket

Give students a card with a drawing of the Earth and a flashlight representing the Sun. Ask them to shade the part of the Earth that would be experiencing day and label it. Then, they should write one sentence explaining why that side has day.

Discussion Prompt

Pose the question: 'Imagine the Earth stopped spinning. What would happen to the part of the world that was facing the Sun? What about the part facing away? Discuss your ideas with a partner.'

Quick Check

Hold up a globe and slowly rotate it. Ask students to signal (e.g., thumbs up or down) whether the point you are touching is experiencing day or night as you spin it. Ask them to explain their signal.

Frequently Asked Questions

How do I explain day and night to Year 2 children?

Use simple language: Earth spins like a top, showing one side to the Sun at a time. Link to observations like morning light and evening dark. Follow with hands-on globe demos where children point to 'day' and 'night' spots, reinforcing the idea through touch and talk.

What happens if Earth stops spinning?

One side stays in constant daylight with extreme heat, the other in endless night with freezing cold. No day-night cycle disrupts sleep, plants, animals. Students predict via drawings, then test with held-still globe models to see unchanging light zones.

How can active learning help teach day and night?

Active methods like rotating globes with torches or outdoor shadow hunts make rotation visible and testable. Children manipulate models to predict outcomes, discuss in pairs why shadows change, and connect to real skies. This builds ownership, corrects errors through evidence, and boosts recall over rote facts.

What models demonstrate Earth's rotation best?

Torches and globes excel: fix the light, spin the globe axis-upright for realistic day-night. Add string 'axis' for clarity. Students mark homes, track lit/dark shifts. Extend to pairs building foam-ball versions, labelling evidence of 24-hour cycles.