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To truly understand the , one must first recognize the two primary systems used to mark its start and end.
To truly define the , it helps to look at it through three different lenses: A. Astronomical Spring
This framework is based on annual temperature cycles and the civil calendar. Meteorologists divide the year into four equal three-month periods. In the Northern Hemisphere, meteorological spring spans March, April, and May. In the Southern Hemisphere, it covers September, October, and November. Ecological and Environmental Changes spring definition season
In the Northern Hemisphere, the vernal equinox occurs on each year. Astronomical spring then lasts until the summer solstice (around June 20-21), the longest day of the year.
Earth's tilt increases solar radiation, warming the air and soil. To truly understand the , one must first
Sap begins to flow in trees, and buds begin to swell.
: It splits the year into four equal three-month periods. The Northern Timing : March 1 to May 31. The Southern Timing : September 1 to November 30. 3. Phenological Spring Meteorologists divide the year into four equal three-month
Phenology is the study of periodic plant and animal life cycle events. Spring is the most active phenological period. Key events include:
The season is defined by several distinct physical and biological shifts:
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