Score: 0
Year 1 · Day 0
Set the tilt and eccentricity, then launch the year!
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About Tilt Shift

Tune axial tilt and orbital eccentricity to keep two hemispheres habitable in this free online seasons game proving Earth's seasons come from tilt, not distance from the Sun.

Tilt Shift is a free online seasons game about the most stubborn misconception in astronomy: the idea that Earth has summer because it sits closer to the Sun. You play a planetary architect who sets axial tilt and orbital eccentricity before each year, then watches two crop hemispheres ride the real physics. Year one locks the tilt at zero degrees and lets you crank eccentricity as far as you like, so you can discover for yourself that distance swings BOTH hemispheres together and cannot make opposite seasons.

Every mechanic maps to real astronomy. The sun's declination swings plus or minus the tilt angle across the year, which changes how high the noon sun climbs and how long it stays up. Your thermometers follow the daily-average insolation at 40 degrees latitude, computed from the sunrise hour-angle formula used in real climate models. Oblique incidence does the visual work: the same solar beam spreads across a larger patch of ground on the tilted-away hemisphere, and shorter days shrink the total further. Eccentricity enters through the inverse-square law, and Earth moves faster near perihelion by Kepler's second law, so the elliptical orbit visibly loiters at aphelion.

Getting this right matters because tilt versus distance is the difference between a real climate lever and a fake one. Earth's perihelion drifts through the calendar on a roughly 21,000-year cycle, and the interplay of that drift with obliquity and eccentricity is the Milankovitch pacing of the ice ages. Uranus, tilted 98 degrees, really does spend decades with one pole in sunlight and one in dark. Once you feel why January perihelion does not roast the planet, the seasons stop being trivia and become geometry.

Key Science Concepts

What You'll Learn

Grade Level: Middle School, High School

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How to play

  1. Dial the Design Set axial tilt and orbital eccentricity, then hit LAUNCH. Tilt leans the seasons, eccentricity stretches the orbit.
  2. Watch the Flux Rays spread thin over the tilted-away hemisphere: same light, more ground. Shorter days pile on. That is winter.
  3. Ride the Green Keep both crop thermometers inside the green band. Days in the green score habitability points.
  4. Spend Tweaks A TWEAK token pauses the year so you can nudge a slider. You only get a few per orbit, so time them near solstices.
  5. Fear the Breach A hemisphere out of band spawns Blight or Frost Snap and drains Crop Health. Tap the gauge for emergency climate vents!
  6. Survive the Years Each year narrows the green and speeds the orbit. Eccentric orbits and Uranus-class tilts await. Bank your score!

Frequently asked questions

Is Tilt Shift free to play?
Yes. Tilt Shift is completely free to play in your browser. There is no download, install or account needed.
What grade level is Tilt Shift for?
Tilt Shift is designed for Middle School, High School students and works well as a classroom activity or homework.
Does Tilt Shift work on phones and tablets?
Yes. Tilt Shift runs in any modern browser on desktop computers, Chromebooks, tablets and phones in landscape mode.

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