🌦️Weather
The phenomena that make the weather, explained simply.
Explore →Weather · Climate · Health · Biodiversity · Astroclimatology
The sky, explained.
From thunderstorms to the Sun's cycles, from warming to its effects on life and on our bodies: Hélie, our little sun, explains the sky in ten illustrated sections — and puts that science in your pocket with ten apps.
Ten sections to understand
🌍Climate
The great machinery that governs weather over the long run.
Explore →🔥Climate Change
Facts, causes, IPCC scenarios, tipping points — and levers for action.
Explore →🩺Climate & Health
What science measures about warming's effects on our bodies — and what protects.
Explore →🦋Climate & Biodiversity
Warming disrupts the living world — and life is our best ally.
Explore →🏙️Climate & Cities
More than half of humanity lives in cities, where heat builds up most.
Explore →🏠Climate & Housing
A home should be a refuge.
Explore →🌬️Climate & Environment
The climate does not change alone: it changes the air we breathe and the energy we produce.
Explore →👥Climate & Society
Climate changes work, school and maps.
Explore →☀️Astroclimatology
The Sun, the orbit, the seasons: the celestial mechanics of light and climate.
Explore →Ten apps to explore
☀️ Parhélie
The same sun, somewhere else on Earth.
Available · €0.99See details →🌅 Aphélie
The Sun's path, to the second.
Available · €0.99See details →🌍 Climathélie
The average climate of any place on Earth.
Available · €0.99See details →🌀 Vigilhélie
Worldwide climate vigilance, in your pocket.
Available · €0.99See details →🩺 Anthélie
The climate ⇄ health atlas of climate-sensitive diseases.
Available · €0.99See details →🌿 Biohélie
Atlas of life · horizon 2100.
Available · €0.99See the page →⛰️ Altihélie
Temperature · altitude · maritime influence.
Available · €0.99See the page →🌡️ Thermohélie
Surface heat in the sun, anywhere.
Available · €0.99See the page →🏠 Domihélie
Your rooms' temperature, without air conditioning.
Available · €0.99See the page →🌾 Agrihélie
The sky, read for your fields.
Available · €0.99See the page →▶ Every app page offers “Hélie speaks”, the guided tour of the app by our little sun, with voice and subtitles, in English and French.
About
Hélie is an independent plain-language science site created and edited by Dr Samer ABOUKAIS. The Hélie family of apps — Parhélie, Aphélie, Climathélie, Vigilhélie, Anthélie, Biohélie, Altihélie, Thermohélie, Domihélie and Agrihélie — extends each section into tools for calculation and exploration, installable straight from the browser.