Seasonbuilding 101: Axial Tilt
Why Worldbuilding Stack Exchange recommends it
Worldbuilding Stack Exchange answerers point people to it when they need a quick, sourced rundown of what different axial tilts do to a planet's climate, especially the tilt past which tropics and poles swap.
Recommended by 4 people across 4 different months, 2016 to 2025.
What it is
An 8-minute explainer from the Artifexian worldbuilding series on how a planet's axial tilt (obliquity) shapes seasons and climate zones. It covers how extreme tilts change season length and temperature, and how tropical and polar zones can swap places at high tilt. Presented by Edgar of Artifexian, with links to climate simulation papers.
What people said
Recommends Kalcipher23 · 2016-10 · Worldbuilding Stack Exchange · on “Choosing axial tilt for human habitable planet for largest temperature variations”
Okay so you should check out Artifexian's Video [this video] on axial tilt. But to sum it up, the higher the tilt the warmer your planet will be and have more extreme seasons. It will also result in less snow, permanent ice, lower humidity and cloud cover. Life like humans won't be able to survive on a tilt greater than 80 degrees. So to answer your question as close to 80 as your comfortable and it will still be plausible. Final thing to note is that if you go above 53 degrees your temperature zones reverse, so your polar regions will be at the equator and your tropics will be be at the poles. The video also has a link to interactive software where you can change the tilt of earth to see tempera
Recommends Ferret Civilization · 2017-10 · Worldbuilding Stack Exchange · on “Hot north and cold south?”
Have you checked out Artifexian's video on seasons, [this video] In it around the 5 minute mark he discusses that if the axial tilt is over 54 degrees the tropical and polar regions switch places.
Recommends Nierninwa · 2019-09 · Worldbuilding Stack Exchange · on “How would the atmospheric circulation look like on a planet with high axial tilt?”
So the axial tilt doesn't actually influence the number of convection cells very much, afaik. It does , however, affect their position [this video] . You might also want to note that a world with a 90° axial tilt would essentially present on side to its star half the year and the other half the rest of the year. That means a long day which is summer and a long night which is winter. This leads to some EXTREME weather patterns that until recently were though impossible to overcome (well, at the very least it was thought to be the case for tidally locked planets, but recent simulations show a fast enough spin can compensate that effect). In the case of a 90° planet, the spin will have no effect on
Recommends mushiroa · 2025-02 · Worldbuilding Stack Exchange · on “Are these atmospheric characteristics scientifically accurate?”
I'm currently building a fantasy world for the purposes of storytelling, and need to figure out its major atmospheric characteristics. The world itself has the following characteristics: Obliquity: 0° (no axial tilt); Radius: 12,756 Km (2 Earth radii); Surface Area: 2,040,257,888 Km²; Gravity: 3.4 G; Mass: ~14 Earth Masses; Atmospheric density: 4 atm; Composition: 87% N2, 10% O2, 1% H2O, 1% Ar, 1500 ppm CO2 and a bit more methane than Earth; Average surface temperature: 20°C; Equator: 30°C on average; Poles: 10°C on average. Day length: 50h; Here's the general map of the world: [LINK] The lighter blues are shallow seas, as I interpret it. And this is the ITCZ's general path around it: [LINK]
Cites Rúnatál Davino · 2018-02 · Worldbuilding Stack Exchange · on “Is a snowball planet a necessary step in the evolution of a life-sustaining ocean planet?”
Unfortunately, planets with high axial tilt such as Uranus probably could never develop such squishy life as Earth's, even in the habitable zone, according to the works cited in this video [this video]
Cites KernelOfChaos · 2018-04 · Worldbuilding Stack Exchange · on “Would the tropic and arctic climate bands switch if the Earth's axial tilt changed to 60 degrees?”
At 4:56 in this video essay, Edgar states that at an axial tilt of 60 degrees, the tropic and arctic climate bands will be switched, so that equatorial regions would be cold and polar regions hot. [this video] Is this plausible? It seems to me that it should be more complicated than that - on a solstice, everything from 30- 90 degrees north or south would be dark, including one of the "tropical" poles, and everything on the opposite side of the planet from 30 - 90 degrees would have a full 24 hours of sunlight.
Cites TheDyingOfLight · 2019-04 · Worldbuilding Stack Exchange · on “Desert poles but arctic equators; trying to find out if specific way is possible”
Have an axis tilt [1] over 56° or under 124° Between these points the poles and the equator switch climate. Technically speaking the poles simply have a higher thermal insolation average per year than the equator. This graphic [5] shows the relationship between axial tilt (obliquity) and the yearly average temperature (insolation) for a given latitude. [LINK] Looking at the graphs having an axial tilt near the limits won't give you polar deserts (actually the poles would be tropical with a ring of deserts around them, but some tweaking could reduce the rainforest to desert) and equatorial ice capes, but overall global moderate average temperatures. At 90° axial tilt, the poles have the warme