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Location: Zanzibar, Tanzania

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

Date Visible Max Height Appears Disappears Share Event
Mon Apr 12, 7:43 PM 3 min 70° 10° above NW 70° above NW  
Tue Apr 13, 6:55 PM 6 min 37° 10° above NNW 12° above ESE  
Wed Apr 14, 7:46 PM 4 min 16° 10° above W 10° above SSW  
Thu Apr 15, 5:42 AM 6 min 37° 10° above SSW 10° above ENE  
Thu Apr 15, 6:58 PM 6 min 33° 10° above WNW 10° above SSE  
Fri Apr 16, 4:56 AM 4 min 17° 13° above SSE 10° above E  
Sat Apr 17, 5:45 AM 5 min 33° 17° above WSW 10° above N  
Sun Apr 18, 5:00 AM 3 min 51° 51° above NNE 10° above NNE  
2021-04-12 16:43:00.0,Mon Apr 12, 7:43 PM,3 min,70°,10° above NW,70° above NW|2021-04-13 15:55:00.0,Tue Apr 13, 6:55 PM,6 min,37°,10° above NNW,12° above ESE|2021-04-14 16:46:00.0,Wed Apr 14, 7:46 PM,4 min,16°,10° above W,10° above SSW|2021-04-15 02:42:00.0,Thu Apr 15, 5:42 AM,6 min,37°,10° above SSW,10° above ENE|2021-04-15 15:58:00.0,Thu Apr 15, 6:58 PM,6 min,33°,10° above WNW,10° above SSE|2021-04-16 01:56:00.0,Fri Apr 16, 4:56 AM,4 min,17°,13° above SSE,10° above E|2021-04-17 02:45:00.0,Sat Apr 17, 5:45 AM,5 min,33°,17° above WSW,10° above N|2021-04-18 02:00:00.0,Sun Apr 18, 5:00 AM,3 min,51°,51° above NNE,10° above NNE|

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.