Star Walk 2 — Best Astronomy App 💫 on Instagram: "Happy December Solstice, everyone! 🌞✨⁠ ⁠ On December 21, 2025 (at 15:03 UTC), the Sun reaches its southernmost point in our sky — officially kicking off astronomical winter in the Northern Hemisphere and summer in the Southern Hemisphere. ⁠ ⁠ Why it happens:⁠ Earth is tilted ~23.5°, so as we orbit the Sun, one hemisphere leans toward the sunlight while the other leans away.⁠ ⁠ What it means today:⁠ • Northern Hemisphere → shortest day + longest

Our Planet on Instagram: "In some snowy regions of Japan, streets are sprayed with water to prevent snow and ice from building up on the road. This system uses underground pipes that release groundwater onto the surface. The water is naturally warmer than freezing air temperatures, which helps melt falling snow and keeps roads passable without heavy plowing. It’s most common in areas with abundant groundwater and frequent snowfall, such as parts of northern and central Japan. However, this is no