Earth, Moon, Sun & Space Models — Investigation · Science 6: Matter, Energy & Earth Systems, Grade 6
How can one system contain different mechanisms, perspectives, and scales? Can one labeled model explain phases, seasons, eclipses, and scale without confusing their mechanisms?
Build and revise an Earth–Moon–Sun model
Investigate
Can one labeled model explain phases, seasons, eclipses, and scale without confusing their mechanisms?
Three 35–45-minute sessions: plan and predict; examine or collect evidence; explain, revise, and reflect. Use the complete supplied record when materials, time, access, or safe conditions are unavailable.
Materials
- Paper or soft model spheres, a fixed light-direction arrow, and observer labels.
- Supplied geometry/scale records and a notebook.
- Optional ordinary lamp arrangement supervised by a parent; paper arrows fully replace it.
Before you begin
No direct Sun viewing, lasers, eclipse viewing, or prediction of safe shore access. Use paper/light-direction models; any ordinary lamp must be stable and cool enough for safe handling.
Plan geometry, scale, and model revision
Keep sunlight direction fixed for each comparison and separate Earth’s rotation, axial tilt, Moon orbit position, and orbital tilt. Numerical scale uses 1 cm per 1,000,000 km; visibility drawings may deliberately use another enlarged-symbol scale.
Method
- Draw a Sun direction, Earth observer, and Moon positions. Mark the illuminated and visible portions separately for four phases.
- Add Earth’s tilted axis with approximately fixed annual direction and distinguish daily rotation from yearly orbital motion.
- Compare solar and lunar shadow alignments. Add orbital tilt so the diagram does not predict an eclipse at every new/full phase.
- Calculate the supplied scaled distances and diameter. Label enlarged bodies or compressed distances honestly.
- Use the supplied reference tide levels to calculate ranges and explain why gravitational tide effects differ from shadows and local forecasts.
- Submit a revised labeled model with a 200–300-word explanation connecting at least three course chapters, a before/after correction, and one remaining limitation.
Supplied illustrative record — use when an actual test is unavailable
Illustrative classroom data authored for analysis, not measurements from a real learner, stream, product, or field study. Actual observations may differ; record them honestly and compare the methods.
| Supplied feature | Value | Model purpose |
|---|---|---|
| Earth–Sun rounded distance | 150,000,000 km | Distance scale |
| Earth–Moon rounded distance | 384,000 km | Distance scale |
| Earth rounded diameter | 12,700 km | Size scale if consistent |
| Period A high / low | 5.5 m / 1.0 m | Fictional tide range |
| Period B high / low | 4.0 m / 2.0 m | Fictional tide range |
| Axis reference | About 23.5° from orbital-plane perpendicular | Seasonal geometry |
Analyze and explain
- Calculate the distance and size values and explain enlarged symbols.
- How do phase viewing geometry and eclipse shadows differ?
- How do tilt and day length explain seasonal energy rather than a distance-only rule?
- What revision corrects a flat-orbit model, and why can it not supply local tide or weather forecasts?
What a strong explanation includes
- Correct scale calculations with cm/mm units.
- Phase, eclipse, tide, rotation, and season mechanisms distinguished.
- At least three chapters connected accurately.
- A visible before/after model correction.
- Specific scale and forecast limitations retained.
Parent / teacher guide: discuss after the investigation
At the stated scale, Earth–Sun distance is 150 cm, Earth–Moon distance is 0.384 cm or 3.84 mm, and Earth’s diameter is 0.0127 cm or 0.127 mm. A large Earth symbol and nearby visible Moon can be useful for geometry but do not follow that numerical size-and-distance scale. The model should label the exaggeration rather than silently use the symbols as measured dimensions. Moon phases depend on how the Earth observer sees the sunlit half, not on Earth’s shadow covering the Moon every week. A solar eclipse requires Sun–Moon–Earth shadow alignment; a lunar eclipse requires Sun–Earth–Moon. Adding orbital tilt corrects an over-simple diagram predicting an eclipse at every new or full phase. Seasons use Earth’s axial tilt, changing light angle and day length, while daily rotation explains day and night. The opposite hemispheric seasons challenge a distance-only account. The tide ranges are 4.5 m for A and 2.0 m for B under the supplied fictional reference. Tides involve gravitational differences, not shadows raising water. Ocean shape and movement affect local outcomes, so neither this table nor a two-bulge sketch can schedule a real shore visit. A final report can connect inquiry/model limits, energy and light, and space geometry, documenting the corrected flat-orbit assumption and the scale labels while identifying the next evidence needed.
Compare this model with the learner’s actual evidence. Different measurements can support a different conclusion; check the reasoning and limitations, not matching wording.