One of the great challenges faced by the events during Grammy Week, including the FireAid benefit, is how to set the proper tone: How do you have a celebratory event like big concert or awards ...

The line dividing day and night on a planet’s surface is called a terminator, and on most days, Earth’s is slanted when viewed from space. But on both of the equinoxes, the terminator aligns ...

The equinox happens when the sun's rays square up with Earth so the day is about as long as night. From then on, the days get shorter, darker, and colder. Here's why. The first day of fall ...