Beginning around sunset, Saturn will be situated closest to the horizon, followed by Mercury, Venus, Jupiter and Mars higher in the sky. While Neptune and Uranus also are within Earth’s line of sight, they’ll require binoculars or a telescope and are extremely difficult to locate, astronomers say.

Though the alignment isn't once-in-a-lifetime rare, the seven other planets in our solar system don't align every year, so it can be a spectacle to witness.Start the day smarter. Get all the news you need in your inbox each morning.

Houstonians will be able to see seven planets in the sky this weekend in what's called a planetary parade. Unfortunately, however, some may not be spotted with the naked eye. Just after dark, it will be possible to view Mercury,