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Opening

GROW · Science · Week 8B · Do

Day and Night: 24-Hour Control Room

Learning objective

I can use a rotating-Earth model to collect and explain evidence across one complete day-night cycle.

Success looks like

  • Record four clear positions for one place on Earth.
  • Link each position to light, darkness and the observer's view.
  • Use the evidence to show how rotation explains the observed day-night pattern without changing the lamp.

We will observe, work together, then use the evidence ourselves.

Arrival task

Arrival task

Choose a route. Think first, then check the answers together.

1. Turn and travel

Distinguish rotation from orbit.

Rotation = turning on an axis; orbit = travelling around another body.

2. Follow the light

A marker goes from the unlit half into the lit half. Which moment does this represent?

Sunrise enters light; sunset leaves light.

3. Read an observation

The lamp stayed on while the marker became unlit. What cause does that observation support?

Track what changed: the marker’s position or the lamp’s output?

4. Complete a cycle

How could you check that you followed the same place through one complete cycle?

One marker; ordered pauses; return to the original position.

Starter

Starter · what could cause night

“Clouds make night because they hide the Sun.”

Read these supplied observations: the model lamp stays on; the same marker is lit, then unlit; no clouds are present.

Which change could explain night? Use a model or a sketch to show your idea.

I do

I do · collect four observations

Earth turns; the model Sun stays to the leftView from above the North Pole. The left half of Earth is lit. A marked place turns anticlockwise from top to left to bottom to right.SunDAYNIGHTNorth-pole viewOne daily turn ≈ 24 hRed dot:one place

Sunrise: our place is entering the lit half.

Simplified view from above the North Pole. The dot represents a place away from the poles. Size, distance and time are not to scale; equal stages do not mean equal daylight everywhere. Keep the Sun fixed for this short daily model.

Rotate means turn on an axis: an imaginary line through Earth. A quarter turn is one of four equal turns making a full turn. Lit means receiving light. A daily cycle is about 24 hours.

We do

We do · match the evidence

Drag a card, or select it then choose its destination.

Choose a card, then a destination. You can change your mind.

I do

I do · write an evidence row

Evidence is what we observe. Apparent describes how the Sun seems from the marked place.

Marker positionLight stateObserver’s view
LEFTLit; facing the lampSun appears higher across the sky

Read across this worked row. Earth rotates west to east, so the observer turns with Earth and sees the Sun’s daily east-to-west movement.

SunDAYNIGHTNorth-pole view

The observer’s sky path is simplified; it is not an exact path for every date and location.

We do

We do · repair a row

Recorded observation: marker RIGHT, facing away; the lamp stayed fixed and on.

Faulty explanation: “It became night because the lamp went out.”

Which repair agrees with the recorded observation?

You do

You do · run the control room

Use the supplied evidence. Write, draw, point, explain or direct an adult.

Open evidence and reference diagrams

Model evidence: fixed Sun on the LEFT; RIGHT half unlit; view from above the North Pole. Follow the same marked place TOP → LEFT → BOTTOM → RIGHT → TOP.

C · Sunrise

SunDAYNIGHTNorth-pole view

Entering light. Sun appears low in the east.

D · Middle of day

SunDAYNIGHTNorth-pole view

Facing light. Sun appears higher across the sky.

B · Sunset

SunDAYNIGHTNorth-pole view

Leaving light. Sun appears low in the west.

A · Night

SunDAYNIGHTNorth-pole view

Facing away. Sun appears below the local horizon.

Rotation = turning on an axis (an imaginary line through Earth). Apparent = how something seems from the observer’s viewpoint. Cycle = a sequence that returns to its start.

Earth rotates west to east, anticlockwise in this view. A daily cycle is about 24 hours. The observer turns with Earth, so the Sun appears to move east to west. The lamp stays on; no clouds are needed.

Supplied model observations, not pupil measurements. Size, distance and time are not to scale. Equal quarter turns simplify season and latitude; they do not establish 12 hours of daylight everywhere.

Standard

1. Make a four-row evidence record for the same marker. Use the supplied frames or run the fixed-lamp model.

Help with this question

The four frames are supplied evidence; a physical model is optional.

2. For each row record marker position, light state and the Sun’s apparent position. Use the four reference observations.

Help with this question

Apparent means how the Sun seems from the marker’s viewpoint.

3. Show a full cycle by returning to the starting point. State what moved and what stayed fixed.

Help with this question

Four quarter turns = one full turn. Check the return, not just four pictures.

4. Use two of your rows to explain why day and night repeat. Include rotation and apparent movement.

Help with this question

Use “In row __ …; later, in row __ …; because Earth …”.

5. Use evidence to challenge “clouds cause night”. Give one limit of this classroom model.

Help with this question

Separate what the model shows from a question it leaves unanswered.

Exit

Exit ticket

Use your book OR one ticket. Show your explanation with the supplied evidence. Say it, write it, draw it, sign it, choose it or show it; an adult can scribe it.

Supplied model observations: the lamp stays fixed and on; no clouds are present. Row D: marker LEFT, lit, facing the lamp. Row A: marker RIGHT, unlit, facing away. View from above the North Pole; Sun LEFT. The model simplifies time and scale.

1. Use rows D and A to explain the change from day to night. Name what moved and what stayed fixed.

Help with this question

Compare the marker’s orientation while the lamp stays on.

2. Explain the Sun’s apparent daily movement, then state one limit of the four-position model.

Help with this question

Link the observer’s turning to the changing view. Choose a limit of scale, time, latitude or season.

Pause

Take a quiet pause.

You can look away from the screen. Come back when you are ready.

The lesson and your work are still here. Close this box to return.

Cold Call

Give thinking time. Invite a response by voice, pointing or showing work. A pupil can pass; check in privately when useful.

Lesson tools

W8A · Day and Night: Sky Shift

Choose a slide or a print route.

Knowledge organiser

Teacher Print Tools

Print a complete pupil pack here, or print just the selected arrival questions from the Arrival task slide. Each pack includes the organiser, supported questions and the selected exit route. Teacher answers are separate in TA Brief.

Knowledge organiser

One A4 reference sheet for your book.

GROW W8B Knowledge Organiser A4 printable science reference or exit task. All text and diagrams are included in this file. GROW SCIENCE | KNOWLEDGE ORGANISER Day and night: the evidence record Learning objective and success criteria I can use a rotating-Earth model to collect and explain evidence across one complete day-night cycle. 1. Record four clear positions for one place on Earth. 2. Link each position to light, darkness and the observer's view. 3. Use the evidence to show how rotation explains the observed day-night pattern without changing the lamp. Track the same place Sun C · Sunrise TOP Entering light Sun D · Middle of day LEFT Facing light Sun B · Sunset BOTTOM Leaving light Sun A · Night RIGHT Facing away North-pole view. Sun fixed LEFT. TOP → LEFT → BOTTOM → RIGHT. Read across an evidence row Position → light state → observer’s view Example: LEFT → lit, facing the lamp → Sun appears higher. The Sun stays on; the marked place moves with Earth. Words that explain Rotation: turn on an axis. Apparent: how it seems from a viewpoint. Cycle: returns to its start. Evidence: observations that support a claim. A claim and a limit Earth rotates, carrying a place into and out of sunlight. Daily cycle: about 24 h. Equal stages do not establish exact local times or 12 h daylight everywhere. Made by Matt

Word help

rotation

Turning on an axis.

axis

An imaginary line through Earth from pole to pole.

apparent

How something seems from a particular viewpoint.

orbit

The path of one body around another.

TA Brief

Current stage

Preparation

Use the supplied diagrams, cards and booklet. An optional cool LED lamp, globe and removable marker can represent the same model. Keep cables secure and sufficient room light for safe movement. Never look at the real Sun or into a bright lamp. Pointing and pupil-directed drawing are equivalent routes.

Real-world link

Choose a route at each task, using what the pupil shows. Switching takes no extra task, record or label.

Teacher answers

Shared activities

C → D → B → A: TOP sunrise, LEFT middle of day, BOTTOM sunset, RIGHT night. Anticlockwise from above the North Pole; west-to-east Earth rotation. Sun appears to move east to west. A daily cycle is about 24 hours. The fixed lamp stays on. Equal stages do not establish equal daylight everywhere.

Supported arrival

  • 1. Accept one clear turn around a centre or axis.
  • 2. Day: the marker receives light.
  • 3. The Earth model moved; the lamp stayed fixed and on.
  • 4. Return to the starting place.

Supported independent task

  • 1. C, D, B, A.
  • 2. TOP entering light; LEFT facing light; BOTTOM leaving light; RIGHT facing away.
  • 3. LEFT/day receives light; RIGHT/night faces away.
  • 4. Earth rotates; the place faces away from the Sun.
  • 5. The marker rotates onto the unlit side even though there are no clouds and the lamp stays on. Clouds can dim daylight, but they are not the cause of this day-night cycle.

Supported exit

  • 1. A is night. Earth rotated the marker onto the side facing away from the lamp.
  • 2. No. It has no clouds, the lamp stays on and the marker becomes unlit when it faces away.

Standard arrival

  • 1. Rotation turns a body on its axis; orbit follows a path around another body.
  • 2. Sunrise.
  • 3. Rotation carried the marker to the side facing away from the lamp.
  • 4. Track one marker through the ordered positions and return it to the start.

Standard independent task

  • 1. Four ordered rows track a single marker, rather than four unrelated places.
  • 2. TOP enters light/Sun low east; LEFT lit/Sun higher; BOTTOM leaves light/Sun low west; RIGHT unlit/Sun below local horizon.
  • 3. The marker returns to TOP after the fourth quarter turn. Earth turns; the model lamp remains fixed and on.
  • 4. Rotation carries a place into sunlight and away from it; we turn with Earth, so the Sun appears to cross our sky. Link specific lit and unlit rows.
  • 5. The model has night without clouds while its lamp stays on. A valid limit concerns scale, seasons, latitude, exact times or the fact that it is a representation, not a measurement of space.

Standard exit

  • 1. Earth rotates, moving the marker from the lit side facing the lamp to the unlit side facing away; the lamp remains fixed and on.
  • 2. We turn with Earth, so the Sun appears to cross our sky. The model cannot establish exact local daylight duration; scale, time and seasonal/latitude detail are simplified.

Stretch arrival

  • 1. Rotation changes which way a place faces over a day; the yearly orbit does not explain the daily change by itself.
  • 2. Sunset followed by night: the marker is leaving the lit half.
  • 3. The first describes what an observer sees; the second asserts an incorrect daily cause. Earth’s rotation changes the observer’s view.
  • 4. No. Real daylight length varies with latitude and season; equal frames are a model simplification.

Stretch independent task

  • 1. North-pole view, same marker, right half unlit throughout; return to the start after four quarter turns.
  • 2. Anticlockwise in this view represents west-to-east Earth rotation. The observer turns with Earth; the Sun appears to move east to west.
  • 3. For example: the lamp stayed on at LEFT and RIGHT; the marker was lit at LEFT and unlit at RIGHT; no clouds were present. Observations support illumination changing with orientation.
  • 4. Moving the lamp could reproduce changing illumination, but it represents an incorrect daily Sun orbit. Similar outputs are not enough to establish the physical cause; the accepted astronomical explanation is Earth’s rotation.
  • 5. Useful: track one place with controlled light. Limit: compressed time, scale, simplified latitude or season. Cannot establish exact sunrise times or identical 12-hour daylight everywhere.

Stretch exit

  • 1. Observation: lamp fixed/on, no clouds, D lit and A unlit. Inference: changed orientation with rotation explains night without clouds.
  • 2. Different models can produce similar illumination; that pattern alone cannot establish the physical cause. Earth rotates in the accepted explanation. The simplified model cannot establish exact real-world sunrise times or daylight lengths.

NASA: Earth facts · NASA: a daily cycle

Next teaching after W8B: w/c 2 November, after half term.

Made by Matt