Backyard stargazers get a monthly guide to the northern hemisphere’s skywatching events with “Tonight’s Sky.” In September, take a dip with the water constellations, Aquarius and Capricornus.

“Tonight’s Sky” is produced by HubbleSite.org, online home of the Hubble Space Telescope. This is a recurring show, and you can find more episodes — and other astronomy videos — at HubbleSite.org.

Visit Tonight’s Sky on HubbleSite.

http://hubblesite.org/explore_astronomy/tonights_sky