It has no flashing lights like an airplane. It moves steadily across the sky getting brighter as it comes closer to your position. Space Station appears as a bright dot about the brightness of the planet Venus. WHEN WILL THE INTERNATIONAL SPACE STATION BE VISIBLE FULLThe passes, called fly-overs, can last from under two minute for a short pass to just under 8 minutes for a full flight from horizon to horizon. ISS orbits at an altitude of about 250 miles and flies along at 17,500 miles an hour. This when the background sky is dark enough but ISS is still catching enough light from the sun for us to see it. WHEN WILL THE INTERNATIONAL SPACE STATION BE VISIBLE WINDOWSThere are two daily time windows when the station is visible: morning and evening twilight – the period just before sunrise and the period just after sunset. During the day, the sky is too bright to see it and as we look up late at night, ISS flies through Earth’s shadow so there’s no sunlight falling on the station for us to see it. Space Station is only visible when it’s illuminated by sunlight. Sometimes if conditions are right you can see two passes in one evening or morning. The orbital period – the time it takes to complete one orbit – is about 92 minutes. The orbit is a circular path around the Earth, as the earth turns under the station, ISS orbits Earth seeing different portions of Earth on each orbit. ISS flies over Philadelphia at least 4 times a day and as many as 7 times a day, all because of how the station orbits and how the Earth turns underneath the orbit. Friday May 1: Appears 3:59a almost overhead, 70 degrees elevation heading toward the NE, gone by 4:04a.Thursday April 30: Appears 4:45a in the west, reaching 42 degrees elevation, heading toward the northeast, gone by 4:50a.Tuesday April 28: Appears 4:44a in the southwest, reaching 68 degrees elevation, heading toward the NE, gone by 4:50a.Space Station Fly-overs for the Philadelphia region, April 27 – May 1: Timing is specific to the Philadelphia region. Share this information with your family across the region, then do it together as a group! This is almost exclusively a ‘naked eye’ experience to be done only when the sky is clear. Looking for something unique to do with your spare time? Become an ISS spotting expert! All you need is your phone and a place to view from – your backyard, your front step, a nearby intersection – but no telescope. WATCH: Ingenious: The Evolution of Innovation.Harry Potter: The Exhibition - FINAL WEEKS!.The letters represent compass directions - N is north, WNW is west by northwest, and so on.ĭisappears represents where in the night sky the International Space Station will leave your field of view. This value, like maximum height, also is measured in degrees from the horizon. If you hold your fist at arm's length and place your fist resting on the horizon, the top will be about 10 degrees.Īppears is the location in the sky where the station will be visible first. The horizon is at zero degrees, and directly overhead is ninety degrees. It represents the height of the space station from the horizon in the night sky. Max Height is measured in degrees (also known as elevation). Visible is the maximum time period the space station is visible before crossing back below the horizon. This is the optimum viewing period as the sun reflects off the space station and contrasts against the darker sky. All sightings will occur within a few hours before or after sunrise or sunset. Time is when the sighting opportunity will begin in your local time zone. What does all this sighting information mean?
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