People on Earth will get a chance next Tuesday to see Venus pass in front of the Sun, a sight that won’t be repeated in most people’s lifetimes.

The 7-hour Transit of Venus will begin at 3:09 p.m. PDT on June 5. In the U.S., the transit will be at its best around sunset.

You should not stare directly at the sun when viewing this. Unlike a solar eclipse by the moon, Venus is too far away and covers up too little of the sun to block its glare. Instead, use some type of projection technique or a solar filter. NASA says a No. 14 welder’s glass is a good choice. Many astronomy clubs will have solar telescopes set up to observe the event.

This year’s transit is the second of an 8-year pair. The first transit happened in 2004.

The next one won’t come around until 2117.