How Far Is the Sun?
Understand why the sun appears high in our sky, how astronomers measured its staggering 93-million-mile distance, and what that gap means for life on Earth.
Like Duolingo, but for How Far Is the Sun?. Tomo turns the whole topic into a game you play five minutes a day, until it actually sticks.
17 levels across 3 sections, about 34 minutes end to end, roughly 7 days at five minutes a day. It moves through Reading the Sun in Our Sky, Grasping the 93-Million-Mile Gap, and What the Distance Does to Earth. It starts from scratch.
Free forever · No credit card · iPhone & Android
Key ideas in How Far Is the Sun?
- The sun's height in the sky is measured as an angle pointing up from the flat horizon
- A sun high overhead means a steep angle toward 90 degrees, not that the physical sun moved closer or further away in miles
- The horizon counts as zero degrees, and directly overhead is the highest possible angle
- When the sun climbs to a steep angle almost directly above you, shadows shrink to their shortest
- When the sun stays low toward the horizon, light hits from the side and casts long stretched shadows
- Midday shadows provide an immediate visual gauge for how high the sun has climbed
- Earth stays tilted at an angle as it loops around the sun throughout the year
- When your home hemisphere tilts toward the sun, the sun traces a higher, steeper arc across your sky
- The sun itself does not bob up and down; our tilted viewpoint changes its daily track
- Only regions near the equator (the tropics) can experience the sun passing completely straight overhead
- Mid-latitude locations see seasonal peaks that reach moderately high angles, but always slightly angled south or north
- Near the poles, the curved shape of Earth keeps the sun skimming low to the horizon even during peak daylight
- The open sky has no overlapping objects, textures, or landmarks to give human eyes depth cues
- Without depth cues, the brain defaults to placing the sun at the same visual layer as the clouds
- Viewing distant objects against a blank background collapses 3D space into a seemingly flat dome
- Sunlight rays arrive at Earth traveling parallel to each other
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 How Far Is the Sun? 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.
When people say the sun is 'high overhead' at midday, what really changed?
Get it right to open this lesson and 16 more in the app.
Where How Far Is the Sun? takes you
- 1
Reading the Sun in Our Sky
- Reading Solar Height with Shadows
- Untangling the Illusion of a Close Sun
- 2
Grasping the 93-Million-Mile Gap
- Visualizing Astronomical Distance
- How Humans Measured the Distance
- 3
What the Distance Does to Earth
- Separating Distance from the Seasons
- The Goldilocks Orbit and Planetary Balance
3 sections · 6 units · 17 levels. Built to play, not to enroll.
Tomo is in ChatGPT
Tomo is also a ChatGPT plugin: the same playable courses, built and played inside your chat.
Add Tomo to ChatGPT- What to ask
- “Make me a Tomo course on black holes.” “Turn this chat into a Tomo course.”
- What you get
- Quick questions with instant feedback, hearts and stars, ready to play in about a minute.
- Where it goes
- No sign-up to start. Connect your Tomo account and your streak carries on in the app.
You pick the voice
How Far Is the Sun? is taught in the Bestie style: your friend who just gets it. 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.
More Science on Tomo
Reading the Night Sky
Transform an overwhelming canopy of stars into a legible cosmic map. Learn to navigate constellations, spot wandering planets, and read the secrets written in starlight using just your eyes.
How Space Works
Make sense of the night sky, journey through our solar system, and uncover the grand forces that shape stars, galaxies, and the universe itself.
The Tilted Earth: Why We Don't Fall Over
Discover the invisible forces that keep our planet steady and what would happen if our world-shaping tilt ever slipped.
How Space Works
Understand what you see when you look up at the night sky and how the cosmos functions. Learn the mechanics of orbits, the lifecycle of stars, and the vast architecture of the universe.
Why the Seasons Change
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.
Earth and Space Science: The Final Push
A high-speed review of the most critical concepts for your exam. Master the patterns of the stars, the movement of our planet, and the secrets hidden in the rock layers.
Start How Far Is the Sun? today.
Download Tomo, search How Far Is the Sun?, and play your first lesson in under a minute.