Which event marks the start of spring in the Northern Hemisphere?

The start of spring in the Northern Hemisphere is marked by the Spring Equinox. This event typically occurs around March 20th or 21st each year and signifies the moment when daylight and nighttime are approximately equal in length. During the equinox, the sun is positioned directly over the equator, leading to this balance of day and night. The arrival of spring is associated with the warming of temperatures, the blooming of flowers, and the overall awakening of nature after the winter months.

As the Spring Equinox approaches, the days gradually become longer, eventually leading into the longer days of summer. This transition is pivotal for many seasonal ecosystems and agricultural practices, signifying a time for growth and renewal after the cold winter months. Understanding the Spring Equinox provides insights into climatic patterns, seasonal changes, and the Earth's relationship with the sun.