La Société Guernesiaise Astronomy Section

Visible passes of the

International Space Station

and other satellites

     The International Space Station (ISS) regularly passes through our skies.

It appears like a very bright star moving from west to east, at an angular velocity similar to a plane, and taking a few minutes to cross the sky.

During morning passes, especially the very early morning ones, the satellite may be in the Earth’s shadow, and therefore invisible, for the first part of a pass.

Similarly, the satellite may enter the Earth’s shadow during the late evening passes, and disappear from view.

Note that many other, fainter, satellites are also visible. The ISS is by far the brightest, being as large as a football pitch.

The much-hyped Humanity Star satellite is likely to be extremely faint   almost never visible to the naked eye.


The link below will take you direct to a page, configured for the latitude and longitude of St Peter Port, Guernsey, on the excellent "Heavens Above" web site which provides up-to-date predictions of the ISS and many other satellites.


Click here for the Heavens Above web site

Then click on “ISS” for Space Station predictions. The table then shows the local time, altitude (in degrees above the horizon) and compass direction to look when it first becomes visible; the time, altitude and direction when it reaches maximum altitude; and the time, altitude and direction when it disappears. In the evening the “end” time may be when it disappears into the Earth’s shadow; in the morning the “start” time may be when it emerges from the Earth’s shadow.

Of special interest are flares from the ‘Iridium’ satellites. You can get more accurate predictions for these flares by changing the location on the Heavens Above web site to your Guernsey parish, or Alderney, Sark or Herm through these links:


Guernsey Observatory



St Andrew’s

St Martin’s

St Peter Port

St Pierre du Bois

St Sampson’s

St Saviour’s






Also see: NASA ISS sighting information for Guernsey.

Below are pictures of the International Space Station and other satellites, mostly taken in Guernsey.


The International Space Station crossing the face of the Sun on 10 June2017


The International Space Station moving from Gemini to Ursa Major  on 23 November 2011 (Guernsey 60-second all-sky camera image)

IMG_4722    International Space Station on 09 August 2007, by David Le Conte.            

The International Space Station (left) preceded the Space Shuttle Endeavour, flight STS-118 (right) by 3 minutes in this sequence taken on 09 August 2007.


Occasionally the Space Station passes in front of the Moon as in these two images taken on 16 February 2016 and 22 May 2016.

2008-03-31 ISS and ATV

The International Space Station (left) preceded (by about 20 seconds and 150 km) by the fainter Jules Verne Automated Transfer Vehicle (ATV) on 31 March 2008.

They were passing above Polaris, and through Ursa Major.

ISS and ATV on 31 March 2008 by David Le Conte.

A flare from the Iridium 95 satellite on 26 September 2006

Launch of the last Space Shuttle Atlantis on 08 July 2011

Iridium flare on 26 September 2006, by David Le Conte.      Atlantis launch

The Space Shuttle rapidly disappeared into cloud, leaving just a smoke trail

Text and pictures © David Le Conte, 2006-2018

Heavens above  On-line satellite prediction


Where is the International Space Station?


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 This page was last updated on 2018 February 24