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Location: Buenos Aires, Argentina

The following ISS sightings are possible from Wednesday Apr 7, 2021 through Thursday Apr 22, 2021

Date Visible Max Height Appears Disappears Share Event
Thu Apr 8, 6:28 AM 6 min 25° 10° above SSW 10° above E  
Fri Apr 9, 5:42 AM 4 min 16° 11° above S 10° above ESE  
Sat Apr 10, 4:57 AM 1 min 11° 11° above SE 10° above SE  
Sat Apr 10, 6:30 AM 7 min 76° 10° above SW 10° above NE  
Sun Apr 11, 5:45 AM 5 min 41° 28° above S 10° above ENE  
Mon Apr 12, 5:00 AM 1 min 18° 18° above ESE 10° above E  
Mon Apr 12, 6:33 AM 5 min 28° 15° above WSW 10° above NNE  
Tue Apr 13, 5:48 AM 3 min 52° 52° above NNW 10° above NNE  
Wed Apr 14, 5:04 AM < 1 min 13° 13° above NE 10° above NE  
Fri Apr 16, 8:04 PM 2 min 42° 10° above NNW 42° above N  
Sat Apr 17, 7:17 PM 5 min 28° 10° above NNW 18° above E  
Sat Apr 17, 8:54 PM 1 min 14° 10° above W 14° above W  
Sun Apr 18, 8:06 PM 4 min 40° 10° above WNW 37° above SSW  
Mon Apr 19, 7:18 PM 6 min 74° 10° above NW 15° above SE  
Tue Apr 20, 8:09 PM 3 min 16° 10° above WSW 15° above S  
Wed Apr 21, 7:21 PM 6 min 24° 10° above W 10° above SSE  
2021-04-08 09:28:00.0,Thu Apr 8, 6:28 AM,6 min,25°,10° above SSW,10° above E|2021-04-09 08:42:00.0,Fri Apr 9, 5:42 AM,4 min,16°,11° above S,10° above ESE|2021-04-10 07:57:00.0,Sat Apr 10, 4:57 AM,1 min,11°,11° above SE,10° above SE|2021-04-10 09:30:00.0,Sat Apr 10, 6:30 AM,7 min,76°,10° above SW,10° above NE|2021-04-11 08:45:00.0,Sun Apr 11, 5:45 AM,5 min,41°,28° above S,10° above ENE|2021-04-12 08:00:00.0,Mon Apr 12, 5:00 AM,1 min,18°,18° above ESE,10° above E|2021-04-12 09:33:00.0,Mon Apr 12, 6:33 AM,5 min,28°,15° above WSW,10° above NNE|2021-04-13 08:48:00.0,Tue Apr 13, 5:48 AM,3 min,52°,52° above NNW,10° above NNE|2021-04-14 08:04:00.0,Wed Apr 14, 5:04 AM,< 1 min,13°,13° above NE,10° above NE|2021-04-16 23:04:00.0,Fri Apr 16, 8:04 PM,2 min,42°,10° above NNW,42° above N|2021-04-17 22:17:00.0,Sat Apr 17, 7:17 PM,5 min,28°,10° above NNW,18° above E|2021-04-17 23:54:00.0,Sat Apr 17, 8:54 PM,1 min,14°,10° above W,14° above W|2021-04-18 23:06:00.0,Sun Apr 18, 8:06 PM,4 min,40°,10° above WNW,37° above SSW|2021-04-19 22:18:00.0,Mon Apr 19, 7:18 PM,6 min,74°,10° above NW,15° above SE|2021-04-20 23:09:00.0,Tue Apr 20, 8:09 PM,3 min,16°,10° above WSW,15° above S|2021-04-21 22:21:00.0,Wed Apr 21, 7:21 PM,6 min,24°,10° above W,10° above SSE|

What am I looking for in the sky?

The space station looks like an airplane or a very bright star moving across the sky, except it doesn't have flashing lights or change direction. It will also be moving considerably faster than a typical airplane (airplanes generally fly at about 600 miles per hour; the space station flies at 17,500 miles per hour).

Below is a time-lapse photo of the space station moving across the sky.

The International Space Station is seen in this 30 second exposure as it flies over Elkton, VA early in the morning, Saturday, August 1, 2015. Photo Credit: NASA/Bill Ingalls The International Space Station is seen in this 30 second exposure as it flies over Elkton, VA early in the morning, Saturday, August 1, 2015. Photo Credit: NASA/Bill Ingalls

Visit the NASA Johnson Flickr Photostream

How do I Spot The Station?

What does all this sighting information mean?

Time is when the sighting opportunity will begin in your local time zone. All sightings will occur within a few hours before or after sunrise or sunset. This is the optimum viewing period as the sun reflects off the space station and contrasts against the darker sky.

Visible is the maximum time period the space station is visible before crossing back below the horizon.

Max Height is measured in degrees (also known as elevation). It represents the height of the space station from the horizon in the night sky. The horizon is at zero degrees, and directly overhead is ninety degrees. If you hold your fist at arm's length and place your fist resting on the horizon, the top will be about 10 degrees.

Appears is the location in the sky where the station will be visible first. This value, like maximum height, also is measured in degrees from the horizon. The letters represent compass directions -- N is north, WNW is west by northwest, and so on.

Disappears represents where in the night sky the International Space Station will leave your field of view.

Astronomical Horizon chart. Click the link for a detailed description of the astronomical horizon and sighting alert messages.

National Aeronautics and Space Administration Page Editor: Bill Keeter NASA Official: Jacob Keaton