Starting off with astronomical seasons, this system bases itself on the Solstices and Equinoxes that occur each year as Earth ...

The vernal equinox arrives on Thursday, marking the start of the spring season for the Northern Hemisphere and the fall in ...

The Griffith Observatory was the perfect place to welcome spring. It’s an observatory, planetarium, and exhibition space that ...

The vernal equinox arrives on Thursday, marking the start of the spring season for the Northern Hemisphere and the fall in ...

Spring officially begins on March 20 each year at approximately 5:01 AM EST, according to NASA. Yes, today officially marks ...

Thursday is the first day of spring, or the vernal equinox, in the Northern Hemisphere. During an equinox, the center of the sun is on the same plane as the equator. After the vernal equinox in March, ...

This story was updated to add new information. Spring has sprung, bringing warmer days and blooming flowers. Thursday is the first day of spring, or the vernal equinox, in the Northern Hemisphere.

It may be hard to believe since most of Siouxland just went through a blizzard, but the spring equinox occurred at 4:01 a.m.

which causes the Earth’s axis to constantly point in a different direction,” the website says. “Since the seasons are defined as beginning at strict 90-degree intervals, these positional ...

Astronomical seasons are marked by equinoxes and solstices ... Equinoxes are the only two times of the year when the earth's axis isn’t tilted toward or away from the sun, which results in ...