Pumpkin spice, cooler nights, football weekends and clock changes: fall is on the horizon. But the official start of autumn isn’t about lattes or leaf piles. It comes down to astronomy. When does fall ...

Chicago has four seasons (or more, depending on who you ask), but what exactly makes the seasons change throughout the year?

As the earth spins on its axis, producing night and day, it also moves about the sun in an elliptical (elongated circle) orbit that requires about 365 1/4 days to complete. The earth's spin axis is ...

Why Do We Have Different Seasons? The cycle of the seasons is caused due to how Earth moves around the sun and because of its tilt in space. Earth rotates like a ball on its axis – the imaginary line ...