COEUR d'ALENE - Eyes to the skies, everybody.

The International Space Station passed across the Idaho horizon in perfect view on Friday at 9:30 p.m., visible to the naked eye.

Did you miss it?

No worries.

You can catch it again.

"It happens all the time," said Jennifer Stanfield, NASA spokeswoman at the Marshall Space Flight Center in Huntsville, Ala. "You'd be surprised how often it flies over and you just don't know it."

Just click onto NASA's website for tracking the course of the research station, which spells out the date and time it will next be close enough to view from a front porch.

The site, http://spaceflight.nasa.gov/realdata/sightings/SSapplications/Post/JavaSSOP/JavaSSOP.html, allows folks to type in their zip codes and identify when the next sighting there is scheduled.

Details are listed under "Next Sighting."

The site specifies the exact minute the station will be in view, and the direction folks should be facing.

Clicking on "SkyLog" will show how long the station will be in view, or the "pass" time.

Nighttime viewing is obviously best, Stanfield said.

And no binoculars are needed, she said.

"If you've never seen it before, you'll be surprised how clear it is," she said. "On a clear night, I'm telling you, it's magical."

Just look for the brightest star, she said.

"It will not blink. It will gracefully glide across the horizon," Stanfield said.

How often does it coast by?

Well, the station - larger than a full size soccer field - completely orbits the earth every 90 minutes.

It travels between 17,000 and 17,500 miles per hour.

"Something has to remain at that speed in space to remain in orbit," Stanfield said. "That's an average speed."

The space station started construction in 1998. Now fully assembled, the station has had a human on board every day for its last 10 years in orbit.

The station is used for research, including how physics and human physiology is affected by the absence of gravity.

"You often see images of astronauts exercising in space," Stanfield said. "That's because bones atrophy, the heart can get bigger, because the body is not experiencing gravity. There are some fundamental changes when there is not the gravity of Earth."

A joint project between several nations, the station is great viewing for educational purposes or just for fun, Stanfield said.

"It's truly the crown jewel of the space program," she said.