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ScienceSpace Systems & Earth's HistoryAges 10–11

Shadows

Represent data in graphical displays to reveal patterns of daily changes in shadow length and direction, day and night cycles, and seasonal star patterns

Lesson

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“A shadow forms where an object blocks light. It points away from the source. A low source often makes a longer shadow than a high one. Earth’s rotation changes the Sun’s apparent direction and height through the day. Solar noon need not be clock noon. Safety: Battery torch only; no mains lamp, laser, sunlight or darkened walking area. Stop: Stop indoors after three torch positions. No outdoor shadow monitoring or Sun viewing is part of this task.”

Bring to the table

  • Paper
  • Pencil
  • Ruler
  • Folded paper post 5 cm high
  • Battery torch
  • Adult-held post base
Extra for the adult

Worked example. I plot 12:00 at 7 cm, shorter than 15 cm and 13 cm. The illustrative Sun is higher near this reading. The shortest shadow is not always at clock noon.

Optional challenge. Explain why three readings cannot locate the exact shortest-shadow time.

What to notice. Keep tables, graph and the actual result note: Daily shadow measurement: NOT_ASSESSED. Note setup help, unclear edges and whether indoor model lengths were measured. Fictional graph data do not supply daily measurements.

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A shadow forms where an object blocks light. It points away from the source. A low source often makes a longer shadow than a high one. Earth’s rotation changes the Sun’s apparent direction and height through the day. Solar noon need not be clock noon. Safety: Battery torch only; no mains lamp, laser, sunlight or darkened walking area. Stop: Stop indoors after three torch positions. No outdoor shadow monitoring or Sun viewing is part of this task.

Materials: Paper; Pencil; Ruler; Folded paper post 5 cm high; Battery torch; Adult-held post base 1. Draw a cross labelled N at top, E right, S below, W left. Stand the 5 cm post at its centre. Adult holds the base and aims the torch at the paper, never eyes. Keep safe room lighting. 2. Measure post shadows in three model positions: torch 15 cm horizontally east of the post and 10 cm above paper; 15 cm south and 20 cm high; 15 cm west and 10 cm high. Record each actual shadow length in cm and direction. Do not substitute a predicted result if a shadow edge is unclear. 3. Make a separate supplied-data table: illustrative outdoor readings from one northern mid-latitude day—09:00, 15 cm, northwest; 12:00, 7 cm, north; 15:00, 13 cm, northeast. These are fictional practice values, not measurements or a universal daily schedule. 4. Graph the illustrative readings: horizontal axis 09:00–15:00 in equal 3-hour intervals; vertical axis 0–16 cm in 2 cm intervals. Plot and join the three points. Add shadow-direction arrows beside the table. 5. Compare the model and supplied data. Explain the shorter middle shadow and connect daily change to Earth's rotation. Label measured model rows separately from illustrative rows. Add this assessment note to the result: Daily shadow measurement: NOT_ASSESSED. This task does not collect actual daily outdoor measurements. Done: Finish model rows or the declared fallback, the illustrative graph, a cause-and-limit sentence and the assessment note. Daily shadow measurement remains NOT_ASSESSED. Proof: Keep tables, graph and the actual result note: Daily shadow measurement: NOT_ASSESSED. Note setup help, unclear edges and whether indoor model lengths were measured. Fictional graph data do not supply daily measurements. Stop: Stop indoors after three torch positions. No outdoor shadow monitoring or Sun viewing is part of this task.

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Learning resources

Extra practice links — they do not replace Gakuva’s teaching approach.

NASA Space Place · Practice link — not the full lesson

Sun

Open practice (new tab)
Before you open · source notes

Sun supports Shadows. An adult previews and guides; this is a learning page, not a scored quiz.

Free educational page, no sign-in required for the tested path.

Before you open

Ask the learner one fact they learned and one question they still have.

Opening this link does not save learning or assess mastery.

Source, access and review notes

Public NASA Space Place page. An anonymous GET on 2026-11-12 returned HTTP 200 with no login or payment prompt for this URL. Opening the link does not save practice or assess mastery. An adult should preview and guide the learner.

NASA Space Place. “Sun.” External page; Gakuva does not copy, host, embed, or redistribute materials.

Unknown — link only

Check understanding

  • Measure and record shadow length and direction at different times of day
  • Create a graph showing how shadow length changes throughout the day
  • Connect shadow patterns to the sun's apparent position and Earth's rotation
“Can your child measure their shadow at different times of day, plot it on a chart, and explain why it's longest in the morning and evening but shortest at midday?”

Curriculum record

Type
Procedural
Subject
Science
Domain
Space Systems & Earth's History
Age range
Ages 10–11

Standards

ngss-k5:5-ESS1-2