When Is the First Day of Spring? | Spring Equinox 2025 Explained

The spring equinox marks the astronomical beginning of spring in the Northern Hemisphere. In 2025, it occurs on Thursday, March 20, at 5:01 a.m. EDT. On this day, the Sun crosses the celestial equator, making day and night nearly equal in length.

What Happens During the Spring Equinox?

The Earth’s axial tilt causes the amount of sunlight each hemisphere receives to vary throughout the year. During the equinox, the Sun aligns directly above the Earth’s equator. This results in nearly equal daylight and nighttime hours across the planet. After the equinox, the Northern Hemisphere experiences longer days leading up to the summer solstice in June.

The equinox happens simultaneously worldwide, though local time differences may alter its recorded date in different regions. While it signals spring in the Northern Hemisphere, it marks the start of autumn for those in the Southern Hemisphere.

Why Is It Called the Spring Equinox?

The word equinox comes from the Latin words “aequus” (equal) and “nox” (night), reflecting the nearly equal division of daylight and darkness. There are two equinoxes each year—spring (vernal) equinox in March and autumnal equinox in September.

Cultural and Historical Significance

Many ancient cultures recognized and celebrated the equinox as a key seasonal shift. Historical sites such as Stonehenge in England and Chichen Itza in Mexico align with the Sun during the equinox. The Persian New Year, Nowruz, also takes place on this day, symbolizing renewal and rebirth.

The Spring Equinox and Easter

The equinox also plays a role in determining Easter’s date. Easter falls on the first Sunday after the first full moon following the equinox. This connection ties into historical lunar calendars used in religious traditions.

How Does the Equinox Affect Nature?

With longer daylight hours, plants start blooming, animals become more active, and migratory birds return north. The equinox signals a time of renewal in nature, inspiring seasonal planting and agricultural cycles.

Key Facts About the Spring Equinox 2025

• Date: March 20, 2025
• Time: 5:01 a.m. EDT
• Northern Hemisphere: First day of spring
• Southern Hemisphere: First day of autumn
• Day and night length: Nearly equal worldwide

The spring equinox is more than just a date on the calendar. It marks a scientific phenomenon that affects nature, culture, and timekeeping. As the Sun moves northward, longer days and warmer weather arrive, making it a perfect time to embrace seasonal changes and new beginnings.

More…

• https://www.overheretoronto.com/march-equinox-2025-in-canada
• https://www.countryliving.com/life/a26845009/what-is-the-spring-equinox
• https://www.almanac.com/content/first-day-spring-vernal-equinox