Perihelion Day 2025. On this day, the earth is at the point in its orbit where it is closest to the sun. For 2025, our closest point comes at 13 utc on january 4 (7 a.m.
Perihelion 2025 occurs on january 4, 2025 at 8:28 a.m. It’s the reason why perihelion day is observed at the beginning of january.