You’re about to experience either the longest or shortest day of the year ☀️❄️ On 21 December 2025 at 16:03 CET, Earth will reach the December solstice. This is the moment when the terminator - the line between day and night - tilts to its maximum angle relative to the equator. That tilt, about 23.5° (the same as Earth’s axial tilt), brings: - the shortest day of the year in the Northern Hemisphere - and the longest day in the Southern Hemisphere The December solstice marks the start of winter in the north and summer in the south. Swipe to journey back five hundred twenty-five thousand minutes… give or take through the key turning points of Earth’s orbit, and explore: - 19 December 2025 (two days before the solstice) - September equinox (2025) - June solstice (2025) - March equinox (2025) - December solstice (2024) 📸 @eumetsatmedia, processed by @europeanspaceagency