Lots of apps help us pretend to be astronauts, but which apps do astronauts use when they’re pretending to be normal, Earth-bound humans? We asked three former spacemen and spacewomen about the apps they’d recommend to amateur stargazers.

Chosen by: Three-time spacewalker David Wolf, who spent 128 days aboard Russian space station Mir. (That’s him in the photo above, pictured at work.)

What it does: Serves as your personal stargazer, identifying stars, constellations, and celestial bodies—day or night.

Why he loves it: “I like thinking of our Earth as a spacecraft and our nighttime sky as its viewport. SkyView allows me to look at the motion of Earth and other planetary bodies as though we’re all navigating through the heavens on Spacecraft Earth.

“Just as on the ISS or Space Shuttle, I feel at ease checking each night that our trajectory is correct and no major unanticipated disturbances have occurred. Space habits are hard to break—navigating Earth using SkyView puts me right back in the ship.”

Chosen by: Dottie Metcalf-Lindenburger, who spent 15 days in space and commanded NASA Extreme Environment Mission Operations, which sends astronauts, engineers and scientists to an undersea research station to simulate space exploration.

What it does: Offer professional-grade weather forecasts for serious meteorology enthusiasts (or pilots).

Why she loves it: “I started using RadarScope as an astronaut preparing for T-38 flights across the country. When you fly in a jet, you’re constantly thinking about the weather. Is it safe to fly? Where should I avoid? If I have a problem, where can I land?

“Now, as a geologist, I use it for the same reasons. I can prepare proper dress or stop work for safety reasons if I see dynamic weather building nearby. And I use it as a mom, for soccer games, hiking, and theme parks!”

Chosen by: Clayton Anderson, who spent 152 days on board the International Space Station.

What it does: Tracks the (surprisingly fast!) orbit of the International Space Station.

Why he loves it: “With Pass Finder and just a rudimentary (and easy to gain) understanding of azimuth, elevation, and direction, anyone can spot the International Space Station.

“The app also provides the magnitude—or brightness—of the ISS, allowing helpful comparisons to other bright objects in the sky: planets like Venus and Mars, and stars like Sirius, Betelgeuse, and the North Star. It gives you the start and stop times for the pass, and even lets you set a five-minute reminder, so you’ll never miss a pass. Check it out and keep looking up—I always did!”