Every six months, the equinox splits Earth's day almost in half. Here's how it happens—and why people have celebrated it ...

Once a year, at a single precise instant, our tilted, spinning planet reaches a state of geometric equilibrium, and the whole ...

Despite months of cold weather and frigid Ohio temperatures, the March equinox marks the official astronomical start of ...

The 2026 vernal equinox was set to occur on March 20 at 10:46 a.m. EDT, marking the astronomical start of spring with nearly ...

Spring begins Friday, March 20, at the exact moment of the vernal equinox. Here’s the precise time it happens and what it ...

The Sun crosses the Celestial Equator this week, but what exactly does that mean?