Solar Shadows: Designing a Daily and Seasonal Playground
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Solar Shadows: Designing a Daily and Seasonal Playground

Grade 5Science20 days
Fifth-grade students take on the role of playground architects to solve the "Melting Slide" mystery by designing an interactive "Shadow-Clock Playground" that reveals Earth’s daily and seasonal patterns. Through field observations and data graphing, students track shadow movements and seasonal star visibility to strategically place equipment and shade structures. Integrating concepts of gravity and stellar brightness, they justify their architectural choices with scientific evidence to create a functional park model that demonstrates the predictable relationship between Earth's movements and the Sun.
Shadow PatternsEarth's RotationCelestial MechanicsGravityEngineering DesignData AnalysisSolar System
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Inquiry Framework

Question Framework

Driving Question

The overarching question that guides the entire project.How can we design an interactive "Shadow-Clock Playground" that uses Earth’s gravity and the Sun’s unique light to help visitors discover and predict the hidden patterns of our planet’s daily and seasonal journey?

Essential Questions

Supporting questions that break down major concepts.
  • How can we design an interactive playground that uses the Sun’s shadows to reveal the hidden patterns of Earth's movement?
  • How does the length and direction of a shadow change from sunrise to sunset, and how can we use that data to create a 'human sundial'?
  • How does the Earth’s rotation on its axis explain why the Sun appears to move across the sky while we stay in one place?
  • Why does the Sun appear so much larger and brighter than other stars, and how does this affect our ability to see shadows during the day versus at night?
  • If gravity pulls everything toward the center of the Earth, how does that 'downward' pull help us keep our playground equipment and shadow-makers (gnomons) perfectly aligned?
  • How can we use graphs and charts to help park visitors predict where their shadow will be during different months of the year?
  • How do the stars we see at night change with the seasons, and how can we incorporate these seasonal 'sky maps' into our park design?

Standards & Learning Goals

Learning Goals

By the end of this project, students will be able to:
  • Students will collect, record, and represent shadow data in graphical displays (such as bar graphs or line plots) to reveal and predict daily and seasonal patterns in the sun's apparent motion.
  • Students will construct an evidence-based argument explaining how Earth’s gravitational force pulls objects toward the center of the planet and how this force is essential for the stability and orientation of their playground structures.
  • Students will explain the relationship between a star's distance from Earth and its apparent brightness, specifically justifying why the Sun is the primary light source for their shadow-clock design.
  • Students will develop a design for an interactive playground that incorporates a 'human sundial' and seasonal 'sky maps,' demonstrating their understanding of Earth's rotation and orbital journey.
  • Students will analyze and interpret data regarding the seasonal appearance of stars to create educational signage for park visitors that explains why certain constellations are visible only during specific months.

Next Generation Science Standards (NGSS)

5-ESS1-2
Primary
Represent data in graphical displays to reveal patterns of daily changes in length and direction of shadows, day and night, and the seasonal appearance of some stars in the night sky.Reason: This is the core of the project. Students are directly tracking shadow patterns and seasonal star changes to design their park features.
5-PS2-1
Secondary
Support an argument that the gravitational force exerted by Earth on objects is directed down.Reason: Students use this standard to explain why their playground structures (gnomons) remain upright and how the 'downward' pull toward the center of the Earth is a constant across the spherical planet.
5-ESS1-1
Secondary
Support an argument that differences in the apparent brightness of the sun compared to other stars is due to their relative distances from Earth.Reason: This explains why the Sun's light is powerful enough to create distinct shadows for the playground, unlike distant stars, and helps visitors understand the Sun's unique role in our solar system.
3-5-ETS1-1
Supporting
Define a simple design problem reflecting a need or a want that includes specified criteria for success and constraints on materials, time, or cost.Reason: Since the project involves designing a public park, students must follow engineering design principles to meet the 'needs' of the visitors and the 'constraints' of the shadow-clock functionality.

Entry Events

Events that will be used to introduce the project to students

The 'Melting Slide' Mystery

A local 'City Planner' (a guest speaker or teacher in character) presents a problem: the town's newest park has been built, but the playground equipment is dangerously hot at 2:00 PM and the picnic tables are in deep darkness by 4:00 PM. Students are tasked with using shadow data to 'save the park' by redesigning the layout so that shadows provide shade and light exactly when and where they are needed most.
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Portfolio Activities

Portfolio Activities

These activities progressively build towards your learning goals, with each submission contributing to the student's final portfolio.
Activity 1

Shadow Sleuths: Tracking the Sun’s Path

Before students can fix the 'Melting Slide' mystery, they must understand the predictable dance of shadows. In this activity, students act as field researchers, tracking the movement of a shadow over a single day to identify the patterns of Earth's rotation.

Steps

Here is some basic scaffolding to help students complete the activity.
1. Set up a 'Gnomon' (a vertical pole or stick) in a sunny spot on the school grounds.
2. Measure the length of the shadow and record its direction (using a compass) every hour from 9:00 AM to 2:00 PM.
3. In the classroom, transfer this data into a line graph showing how the shadow's length decreases toward noon and increases afterward.
4. Write a 'Pattern Prediction' explaining where the shadow would be at 4:00 PM based on the data collected.

Final Product

What students will submit as the final product of the activityA 'Daily Shadow Profile' featuring a multi-line graph (length vs. time) and a compass-rose diagram showing the change in direction.

Alignment

How this activity aligns with the learning objectives & standardsAligns with 5-ESS1-2: Represent data in graphical displays to reveal patterns of daily changes in length and direction of shadows. Specifically, it focuses on the science practice of 'Analyzing and Interpreting Data.'
Activity 2

The Star Power Pitch: Why the Sun?

Visitors might ask why we use the Sun for our clock and not a bright star like Sirius. Students will conduct a distance-intensity investigation to explain why the Sun is the only star capable of casting the distinct shadows needed for their playground design.

Steps

Here is some basic scaffolding to help students complete the activity.
1. Use two identical flashlights: one held 10 centimeters from a wall and one held 5 meters away. Observe the 'apparent brightness' of each.
2. Research the distance of the Sun versus the distance of the next closest star (Proxima Centauri) and the brightest night star (Sirius).
3. Analyze how the 'distance' in the flashlight model explains why the Sun appears as a giant disk while other stars appear as tiny points.
4. Draft an argument for a park plaque explaining to visitors why the 'Shadow-Clock' only works during the day despite there being trillions of other stars.

Final Product

What students will submit as the final product of the activityA 'Star Power Evidence Card' that uses a Claim-Evidence-Reasoning (CER) format to explain the Sun's unique role in the park.

Alignment

How this activity aligns with the learning objectives & standardsAligns with 5-ESS1-1: Support an argument that differences in the apparent brightness of the sun compared to other stars is due to their relative distances from Earth.
Activity 3

The Gravity Anchor: Engineering for a Round Earth

For a shadow clock to be accurate, the gnomon must be perfectly vertical. But what does 'vertical' mean on a round Earth? Students will investigate gravity to ensure their playground equipment is safely anchored and 'downward' facing, no matter where a visitor stands.

Steps

Here is some basic scaffolding to help students complete the activity.
1. Use a globe and small figurines with magnets to demonstrate that 'down' always points toward the center of the sphere, regardless of location (North Pole vs. Equator).
2. Conduct a 'Plumb Line' experiment using a string and a weight to find the perfect 'downward' line for their playground structures.
3. Diagram the 'Center of Gravity' for a piece of playground equipment (like a swing set) to show how Earth's pull keeps it stable.
4. Write an 'Engineering Guarantee' explaining how gravity ensures the shadow-clock remains accurate by pulling the gnomon toward Earth's center.

Final Product

What students will submit as the final product of the activityA 'Gravity Foundation Blueprint'—a cross-section drawing of the playground equipment showing the pull of gravity toward Earth's core.

Alignment

How this activity aligns with the learning objectives & standardsAligns with 5-PS2-1: Support an argument that the gravitational force exerted by Earth on objects is directed down (toward the center of the Earth).
Activity 4

The Celestial Carousel: Mapping Seasonal Stars

The park isn't just for daytime! Students will design 'Seasonal Star Gazing Stations.' They must identify which constellations are visible during the park's 'Grand Opening' month versus six months later, explaining the patterns of Earth’s orbit.

Steps

Here is some basic scaffolding to help students complete the activity.
1. Use a star-mapping app or physical star charts to identify key constellations visible in your location during different seasons (e.g., Orion in Winter vs. Scorpius in Summer).
2. Model Earth's orbit around the sun using a lamp and a globe to visualize why our 'view' of the night sky changes as we move.
3. Select one 'Anchor Constellation' for each season and illustrate its position in the sky relative to the park's horizon.
4. Create 'Visitor Guide' captions for the tiles that explain why these stars 'disappear' during certain times of the year.

Final Product

What students will submit as the final product of the activityA set of four 'Seasonal Sky Maps' (Winter, Spring, Summer, Fall) to be installed as tiles in the playground floor.

Alignment

How this activity aligns with the learning objectives & standardsAligns with 5-ESS1-2: Represent data in graphical displays to reveal patterns of... the seasonal appearance of some stars in the night sky.
Activity 5

The Master Architect: Building the Shadow-Clock Park

It’s time to solve the 'Melting Slide' mystery once and for all. Students will combine their shadow data, gravity knowledge, and star maps to create a final architectural model of the Shadow-Clock Playground. They must place equipment strategically so that shadows provide cooling shade during the hottest hours.

Steps

Here is some basic scaffolding to help students complete the activity.
1. Review the 'Melting Slide' data (2:00 PM heat) and use your 'Shadow Sleuth' graphs to determine where a shade structure or tree should be placed.
2. Design the 'Human Sundial'—a central plaza where a visitor's own shadow points to the current time marked on the ground.
3. Place 'Gravity-Safe' equipment and 'Seasonal Star Tiles' in the layout, ensuring they don't interfere with the shadow-clock's path.
4. Present the final 'Shadow-Clock Playground' proposal to the 'City Planner,' using data from all previous activities to justify the design choices.

Final Product

What students will submit as the final product of the activityA 3D Scale Model or a detailed Color-Coded Master Plan of the playground, including a 'Shadow Schedule' for visitors.

Alignment

How this activity aligns with the learning objectives & standardsAligns with 3-5-ETS1-1: Define a simple design problem... and 5-ESS1-2: Representing data to reveal patterns. This activity synthesizes all previous standards into a final engineering solution.
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Rubric & Reflection

Portfolio Rubric

Grading criteria for assessing the overall project portfolio

The Shadow-Clock Playground Mastery Rubric

Category 1

Pattern Analysis: Shadows and Stars (5-ESS1-2)

Evaluates the student's ability to represent and interpret data regarding Earth's daily rotation and annual orbit to predict observable patterns.
Criterion 1

Shadow Data Representation & Pattern Prediction

Students collect, record, and transform shadow measurements (length and direction) into graphical displays to reveal predictable patterns of Earth's rotation.

Exemplary
4 Points

Creates a flawless, multi-line graph and compass rose with high precision. Patterns are used to make an exceptionally accurate and mathematically justified prediction for shadow positions at 4:00 PM.

Proficient
3 Points

Correctly transfers shadow data into a clear line graph and compass rose. Provides a logical prediction for future shadow positions based on the established data trend.

Developing
2 Points

Constructs a basic graph with minor inaccuracies in scale or plotting. Prediction is provided but may not fully align with the data trend shown.

Beginning
1 Points

Shadow data is incomplete or incorrectly graphed. Prediction is missing or lacks connection to the recorded observations.

Criterion 2

Seasonal Celestial Mapping

Students use star charts and orbital models to explain why specific constellations are visible only during particular seasons.

Exemplary
4 Points

Accurately maps four seasonal constellations with sophisticated explanations of how Earth's orbital position changes our night-sky view. Identifies the relationship between the horizon and the ecliptic.

Proficient
3 Points

Correctly identifies anchor constellations for each season and explains that visibility changes because of Earth's movement around the Sun.

Developing
2 Points

Identifies constellations for different seasons but the explanation of Earth's orbital journey is vague or contains minor misconceptions.

Beginning
1 Points

Lists stars or constellations without clear seasonal organization or connection to Earth's orbit.

Category 2

Scientific Argumentation and Modeling

Evaluates the student's ability to use evidence and scientific principles to support arguments about light intensity and gravitational pull.
Criterion 1

Stellar Distance and Apparent Brightness (5-ESS1-1)

Students support the claim that the Sun's apparent brightness and size are due to its proximity to Earth compared to other stars.

Exemplary
4 Points

Constructs a sophisticated CER argument using specific data from the flashlight investigation and actual stellar distances to explain why the Sun is the only star capable of creating playground shadows.

Proficient
3 Points

Develops a clear Claim-Evidence-Reasoning (CER) card that explains the relationship between distance and apparent brightness using evidence from the flashlight model.

Developing
2 Points

Provides a claim and some evidence, but the reasoning does not fully connect the concept of 'distance' to why we see the Sun differently than other stars.

Beginning
1 Points

States a claim about the Sun being bright but lacks supporting evidence or a logical explanation of distance.

Criterion 2

Gravitational Force and Stability (5-PS2-1)

Students argue that gravity pulls toward the center of the Earth and explain how this force ensures the stability of playground equipment.

Exemplary
4 Points

Provides a detailed cross-section blueprint showing Earth's core as the source of the pull. Explains with precision how verticality (plum lines) ensures shadow-clock accuracy across a spherical planet.

Proficient
3 Points

Supports the argument that gravity pulls downward toward the center using a diagram and explains why playground equipment must be aligned with this force for safety and accuracy.

Developing
2 Points

Describes gravity as a downward force but does not clearly identify the 'center of the Earth' as the direction or fails to connect it to the stability of the design.

Beginning
1 Points

Shows limited understanding of gravity; diagram may show objects falling 'down' off the bottom of a globe rather than toward the center.

Category 3

Engineering Design: The Master Architect

Evaluates the student's ability to apply scientific knowledge to solve a real-world engineering challenge.
Criterion 1

Synthesis and Design Solution (3-5-ETS1-1)

Students synthesize shadow data and gravity knowledge to design a functional park that solves the 'Melting Slide' mystery and provides a working human sundial.

Exemplary
4 Points

The final model/plan is an innovative solution that perfectly places shade structures based on data, incorporates all scientific stations seamlessly, and justifies every choice with specific evidence from prior activities.

Proficient
3 Points

The design addresses the heat problem using shadow data, includes a functional human sundial, and places 'Gravity-Safe' equipment in a logical layout.

Developing
2 Points

The design includes some shadow-based elements but may not fully solve the 'Melting Slide' problem or may have minor layout conflicts (e.g., trees blocking the sundial).

Beginning
1 Points

The playground plan is missing key components or does not use shadow data to inform the placement of equipment and shade.

Reflection Prompts

End-of-project reflection questions to get students to think about their learning
Question 1

In our 'Gravity Anchor' activity, we learned that gravity pulls everything toward the center of the Earth. How did this scientific fact change the way you thought about building 'vertical' structures like your gnomons or swings?

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Question 2

How confident do you feel in your ability to look at a shadow graph and predict exactly where a shadow will fall later in the day?

Scale
Required
Question 3

When visitors at your park ask why the 'Shadow-Clock' only works with the Sun and not a bright star like Sirius, which evidence-based reason from your 'Star Power Pitch' would you give them?

Multiple choice
Required
Options
Because the Sun is much larger than every other star in the universe.
Because the Sun is much closer to Earth than any other star.
Because the Sun is the only star that stays in one place in the sky.
Because other stars only come out at night when shadows don't exist.
Question 4

The 'Melting Slide Mystery' was a big problem for our park. How did collecting shadow data help you find a solution that was better than just guessing where to put the equipment?

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Question 5

After mapping the 'Celestial Carousel' and the daily shadow patterns, what is one thing about Earth's movement that surprised you or made you look at the sky differently?

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Optional