The astronomical review begins with the primary driver of seasons: .
A common myth is that seasons are caused by Earth getting closer to or further from the Sun. In reality, Earth’s orbit is slightly elliptical (oval-shaped). Interestingly, the Northern Hemisphere is actually to the Sun in January (perihelion) during its winter. This proves that the angle of sunlight , dictated by the tilt, is far more influential than the distance. Why the Astronomical Definition Matters seasons astronomy definition
meteorological seasons (which use fixed three-month blocks like March 1–May 31 for spring), astronomical seasons vary slightly in date each year because the Earth's orbit is elliptical and its speed varies. Severson Dells Nature Center +1 Seasonal Transitions (Northern Hemisphere) Season Starting Event Approximate Date Solar Characteristic Spring Vernal Equinox March 20–21 Equal day and night Summer Summer Solstice June 20–21 Longest day of the year Autumn Autumnal Equinox September 22–23 Equal day and night Winter Winter Solstice December 21–22 Shortest day of the year Note: In the Southern Hemisphere, these seasons are exactly reversed (e.g., June marks the beginning of astronomical winter). YouTube +1 10 sites Season - National Geographic Education Seasons * A season is a period of the year that is distinguished by special climate conditions. The four seasons—spring, summer, f... National Geographic Society Meteorological Versus Astronomical Seasons | News Sep 22, 2016 — The astronomical review begins with the primary driver