Here's what happens as the direct rays of the sun slip south of the equator as the seasons change.

The reason why we don't see exactly equal daylight on the equinox is twofold. It has to do with how we measure daylight. We measure it by how long the sun's disk is above the horizon. It also has to ...

Fall equinox 2025 arrives on Monday 22. Find out why the first day of autumn still features a little more daylight than ...

Understanding diffraction and dispersion is key to optical science, influencing technologies like spectroscopy, fiber optics, ...