The spring equinox occurs when the Sun crosses the celestial equator. Earth’s hemispheres receive nearly equal illumination, but local day and night are not exactly twelve hours because sunrise definitions, atmospheric refraction, and latitude affect measured daylight.
Read the complete Ostara pillar guide or open the interactive Wheel of the Year.
What happens at the spring equinox?
Earth’s axis remains tilted, but at the equinox it is oriented so neither hemisphere leans predominantly toward the Sun. The solar cycle then continues: daylight increases in one hemisphere and decreases in the other.
Why “equal day and night” is approximate
The Sun appears as a disc rather than a point, and the atmosphere bends light near the horizon. Sunrise is counted when the Sun’s upper edge appears and sunset when it disappears, adding minutes to the measured day.
Ostara and local season
Modern Ostara can use the equinox as an astronomical anchor while paying attention to local weather, plants, animals, and climate. A calendar date cannot guarantee the same ecological spring everywhere.
A practical observation
Record sunrise and sunset for a week, note where the Sun meets the horizon, and compare your local ecology with the symbolic language you use.
What this means for modern practice
Use historical labels carefully, adapt observance to your local season and ability, and distinguish documented custom from reconstruction or personal ritual. This creates a practice that is both meaningful and transparent.
