A subsolar point has been moving southward since it paused for a moment over the Tropic of Cancer at the June Solstice which marked the beginning of summer. It will now continue southward until the ...

September 22 marks the 2017 fall equinox in the United States and the start of autumn across the northern hemisphere—at the same time in the southern hemisphere the vernal equinox marks the start of ...

So long, winter coats. And hello, spring flowers. Our long, chilly winter finally comes to an end on Monday with the vernal equinox, which marks the beginning of spring in the Northern Hemisphere.

Astronomical summer begins tonight, June 20, at 10:42 p.m. Eastern Daylight Time — the moment of the June solstice. At that instant, the Sun will be directly overhead at the Tropic of Cancer, at a ...

We are almost there, folks. As we speak, the sun's subsolar point is racing northward, toward the celestial equator. In about a week, the vernal equinox will finally bring the official start of ...

On September 22, the Sun will cross the celestial equator and mark the beginning of a new season and the September 2021 fall equinox. For that brief moment during the autumn equinox, night and day are ...