Approximately every 90 minutes the International Space Station (ISS) completes an orbit around the Earth. At the correct times, around sunset and sunrise, the large solar panels on the ISS reflect sunlight downward toward the Earth’s surface. Depending on the orientation of the solar panels and where you are you may be able to see the reflected sunlight off the solar panels. To the naked eye the ISS may appear as bright as Venus, around a -4 apparent magnitude.
This evening, March 21st and tomorrow evening the 22nd the ISS will be visible, weather permitting, as it passes over the midwest United States. Use the links below to see visibility opportunities for your location.
The ISS travels in excess of 17,000 miles per hour and it takes maybe 6 minutes or so to cross the United States from west to east.
Two excellent websites for ISS viewing information are below. You will need to input your location information at both sites.
At the NASA web site you will get a list of the next several dates and times for viewing the ISS that includes it’s rising and setting times and directions of travel (always west to east), and some other information. Pay attention to the maximum altitude and length of time above the horizon.
The Heavens Above website provides a list of viewing opportunities like the NASA web site but in addition you may see a star map showing the ISS path across the starry sky. You will find that this web site has quite a lot to offer with viewing information ranging from the ISS to Iridium satellites and other satellites, planet information, and so on. Well worth bookmarking.