Spring (season)

Spring is the season between winter and summer, associated in temperate regions with rising temperatures, longer days, and renewed plant growth.

Axial tilt: The angle between a celestial body's rotation axis and the perpendicular to its orbital plane. As a hemisphere tilts toward the Sun, spring brings lengthening days and increasing solar energy.
Earth's orbit: The path Earth follows around the Sun over roughly one year. Earth’s orbital motion combines with axial tilt to produce the annual cycle of seasons.
Agriculture: The practice and science of cultivating crops and raising livestock. Spring planting schedules depend on frost risk, soil warmth, and crop-specific growing conditions.
Meteorological season: A season defined by calendar months to align with annual temperature patterns and climate statistics. Meteorological spring begins on March 1 in the Northern Hemisphere, unlike the equinox-based astronomical definition.
Nowruz: The Persian New Year, celebrated at the spring equinox by communities across many countries. The equinox makes spring’s arrival the basis of a major new-year celebration.
Equinox: An astronomical moment when the Sun crosses the celestial equator, bringing nearly equal day and night. The March and September equinoxes mark seasonal transitions in each hemisphere.
Hemisphere: Half of a sphere, especially one of the two halves into which Earth is divided by the equator. Spring occurs at opposite times in the Northern and Southern Hemispheres.
Last frost date: The typical final date of freezing temperatures in a location during a growing season. Gardeners and farmers use it to decide when frost-sensitive plants can be sown or transplanted.
Astronomical season: A season defined by the positions of Earth and the Sun, with boundaries at solstices and equinoxes. Astronomical spring begins at an equinox rather than on a fixed calendar date.
Hanami: The Japanese custom of viewing flowers, especially cherry blossoms. Hanami turns a brief spring bloom into a widely shared seasonal tradition.

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