Summer officially began today (June 21) at 10:57 a.m. EDT (1457 GMT). Summer officially began in the Northern Hemisphere today (June 21), marking the longest day of the year. During the June ...

Spring, summer, fall and winter–the seasons on Earth change every ... is around 23 degrees from vertical for Earth. So, the Northern Hemisphere experiences more intense sunlight during the ...

That ancient bump is what caused the Earth's seasons — times of the year ... Earth is divided into a northern and southern hemisphere by an imaginary ring called the equator.

The vernal equinox arrives on Tuesday, marking the start of the spring season for the Northern Hemisphere ... Astronomical seasons depend on how the Earth moves around the sun.

This collision caused the Earth to wobble or tilt on it's axis, creating seasons! As the axis tilts away from the sun's rays in the Northern Hemisphere, this is the winter solstice. Also known as ...

This year, the Northern ... Hemisphere's seasons are reversed. (Here's the difference between astronomical and meteorological seasons.) On two moments each year—what are called solstices—Earth ...

The Earth’s tilt is the reason for the changing seasons. The top half of the Earth we call the northern hemisphere, and the bottom half we call the southern hemisphere. At this point in the ...

Thursday is the first day of spring, or the vernal equinox, in the Northern Hemisphere ... autumnal equinox occurs in September – when the Earth's axis is tilted neither toward nor away from ...

Earth's axis will be side-on to the sun, meaning there will be more daylight in the Northern Hemisphere from then until June's solstice. Besides the beginning of astronomical spring, it also ...

An animation showcases how the seasons change with ... of sunlight throughout the course of a year. Earth is divided into a northern and southern hemisphere by an imaginary ring called the equator.

a planet that’s perfectly aligned wouldn’t have seasons. But Earth isn’t perfectly aligned on its axis. This small misalignment, called an obliquity, is around 23 degrees from vertical for Earth. So, ...