Why the Seasons Change
Like Duolingo, but for Why the Seasons Change. Tomo turns the whole topic into a game you play five minutes a day, until it actually sticks.
For the part of you with thirty open tabs that never became anything.
79 levels across 8 sections, about 158 minutes end to end, roughly 32 days at five minutes a day. It moves through Reading the Everyday Sky, The Planetary Engine, Thermal Lag and Temperature Timing, Seasons Beyond the Temperate Zone, Local Weather Shapers, The Living Calendar, Seasonal Disruptions and Anomalies, and The Deep History and Future of Seasons. It starts from scratch.
Free forever · No credit card · iPhone & Android
Key ideas in Why the Seasons Change
- A higher sun overhead casts a shorter shadow on the ground
- The sun climbs to its highest midday position in summer and stays much lower in winter
- Midday shadows are noticeably stubby in summer and stretched out long in winter
- The sun only rises precisely due east and sets precisely due west twice a year at the equinoxes
- In mid-latitudes, the sunrise and sunset points wander north during summer
- In winter, the sunrise and sunset points shift noticeably toward the south
- Seasonal temperature changes are driven by sun angle and concentration, not Earth's distance from the sun
- High-angle sunlight hits the ground directly, concentrating its warmth into a compact area
- Low-angle winter sunlight spreads the same energy over a much wider patch of ground, diluting its warmth
- Summer days have the widest, highest arc above the horizon, creating the longest daylight hours
- Spring and autumn share moderate, equal-length arcs of day and night
- Noticing the sunrise reach its northernmost landmark marks the peak of summer
- Noticing the sunrise reverse direction at its southernmost landmark marks the peak of winter
- Winter has the lowest, shortest arc above the horizon, yielding the fewest daylight hours
- Watching the sunrise pass the exact midpoint between the extremes signals the change into spring or autumn
- Earth is physically closest to the Sun in early January
You've tried the other tabs
Thirty open tabs. Four facts you actually kept.
You watched. You nodded. By Sunday it was gone.
One answer, then back to scrolling.
Eight weeks. You meant to finish. You didn't.
Tomo gives Why the Seasons Change the Duolingo treatment: levels, streaks, and quick quizzes that test what you just learned. That game loop is what the tabs above never had, so it's the one you actually finish.
Here's what playing it feels like
A real question from this course. Take your best guess.
Where does the sun climb at midday in summer compared to winter?
Get it right to open this lesson and 78 more in the app.
Where Why the Seasons Change takes you
Uncover the planetary engine that drives our weather from summer heatwaves to winter frosts. Trace how axial tilt, sunlight angles, thermal lag, and global winds shape the rhythms of life across the globe. You will never look at an afternoon shadow or a turning autumn leaf the same way again.
- 1
Reading the Everyday Sky
- Tracking the Sun's Changing Path
- Busting the Orbital Distance Myth
- 2
The Planetary Engine
- Earth's Axial Tilt and Beam Concentration
- Day Length and Daily Energy Budgets
- Solstices, Equinoxes, and Celestial Markers
- 3
Thermal Lag and Temperature Timing
- Earth's Battery: The Thermal Inertia of Water and Land
- Seasonal Lag: Why Peak Sun Is Not Peak Heat
- 4
Seasons Beyond the Temperate Zone
- The Tropics: Wet, Dry, and the Moving Rain Belt
- The Polar Extremes: Midnight Sun and Polar Night
- The Hemispheric Mirror: North Versus South
- 5
Local Weather Shapers
- Jet Streams and Seasonal Storm Tracks
- Continental Versus Maritime Climates
- Topography, Elevation, and Microclimates
- 6
The Living Calendar
- Plant Clocks: Light Triggers and Winter Survival
- Animal Rhythms: Migration, Torpor, and Fur
- Autumn Leaf Chemistry
- 7
Seasonal Disruptions and Anomalies
- The Global Monsoon Engines
- El Niño and Broken Seasonal Cycles
- 8
The Deep History and Future of Seasons
- Milankovitch Cycles: Earth's Long-Term Wobble
- How Climate Change Rewires the Seasons
8 sections · 20 units · 79 levels. Built to play, not to enroll.
You pick the voice
Why the Seasons Change is taught in the Explain Like I'm 5 style: no big words. promise.. Want a different feel? In the app you can spin up the same topic in any of Tomo's teaching styles. Same facts, totally different vibe.
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Start Why the Seasons Change today.
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