Spring arrives in the Northern Hemisphere Monday, and if you're out and about in Southern Arizona you've probably already noticed some seasonal changes. Read about the shifting seasons SonoranDesert FirstDayofSpring SpringEquinox
Monday marked the spring equinox — at least for those in the Northern Hemisphere.As the Earth travels around the sun, it does so at an angle.
During the equinox, the Earth’s axis and its orbit line up so that both hemispheres get an equal amount of sunlight. The spring — or vernal — equinox can land on March 19, 20 or 21, depending on the year. This year it lands on Monday at 2:24 p.m. local time here in Tucson.There are two different ways to carve up the year: Meteorological and astronomical seasons.
Equinoxes, when the sun lands equally on both hemispheres, mark the start of spring and autumn. Solstices, when the Earth sees its strongest tilt toward or away from the sun, kick off summer and winter.For those north of the equator, daylight will keep stretching longer— with earlier sunrises and later sunsets — until the summer solstice in June. The new season signals warmer weather, budding plants and migrating animals.
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