At the equinoxes, the tilt is oriented sideways relative to the Sun, making day and night nearly equal (∼12 hours) globally.
Contrary to common belief, the distance between Earth and the Sun does not cause seasons; in fact, the Northern Hemisphere is physically (perihelion), which is mid-winter. The seasons are dictated by two factors resulting from the tilt: northern hemisphere season
To simplify climate statistics and forecasting, meteorologists and climatologists define seasons based on the annual temperature cycle, not the Sun’s position. At the equinoxes, the tilt is oriented sideways
When a hemisphere tilts toward the Sun, light hits the surface at a steeper, more direct angle, concentrating energy and heat. When a hemisphere tilts toward the Sun, light
This system aligns with the lag in surface heating: the warmest three months (June–August) correspond to summer, even though the maximum solar input occurs at the June solstice.
The primary driver of these changes is . Earth's axis is tilted at approximately 23.5 degrees relative to its orbital plane. As the planet revolves around the Sun, this fixed tilt causes the Northern Hemisphere to point toward or away from the Sun at different times of the year. The Two Ways to Define Seasons