"The tilt of the Earth's axis as it orbits around the sun causes seasons. Different parts of the world receive different amounts of sunlight depending on that angle. In the Northern Hemisphere, we experience winter from December to March, while the Southern Hemisphere soaks up the sun."
"Even though a year is 365 days long, it actually takes 365.25 days for the earth to travel around the sun. Those extra hours add up, causing the need for a leap year every four years. This also messes with calendaring. The spring equinox can fall anywhere between March 19-21 as a result."
Spring arrives in the Northern Hemisphere on March 20, 2026, marking the spring equinox and bringing longer days, warmer weather, and increased Vitamin D from sunlight. Seasons result from Earth's tilted axis as it orbits the sun, causing different hemispheres to receive varying amounts of sunlight throughout the year. The Northern Hemisphere experiences winter from December to March while the Southern Hemisphere enjoys summer during this period, then reverses roles during June through August. The spring equinox date varies between March 19-21 annually because Earth requires 365.25 days to complete its solar orbit, not exactly 365 days. This quarter-day discrepancy necessitates leap years every four years and causes calendar adjustments affecting equinox timing.
Read at Fast Company
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