What to See & When

Here you can find information on;

  • Today's weather forecast for Guernsey
  • Monthly highlights with Sky Charts to help you visualise what celestial bodies are visible
  • Yearly information on the sun, moon, planets and meteors
  • A glossary of astronomical terms used in the various pages

Sky Charts generated by Sky Safari, Simulation Curriculum Corp.

ISS Sighting Opportunites

Below is the latest information from NASA on possible sightings along with more detailed information about seeing ISS and other satellites from Guernsey jump to section.

Retrieved from: NASA Spot the Station on Saturday 18th September 2021

The following ISS sightings are possible from Friday 17th September 2021 through to Sunday 26th September 2021

DATE VISIBLE MAX HEIGHT* APPEARS DISAPPEARS
Friday Sep 17, 2021 8:37 PM 3 min 27° 10° above SSW 26° above SE
Friday Sep 17, 2021 10:13 PM < 1 min 14° 10° above WSW 14° above WSW
Saturday Sep 18, 2021 7:51 PM 5 min 19° 10° above S 10° above E
Saturday Sep 18, 2021 9:26 PM 3 min 55° 10° above WSW 55° above SW
Sunday Sep 19, 2021 8:40 PM 5 min 57° 10° above SW 28° above E
Sunday Sep 19, 2021 10:17 PM 1 min 18° 10° above W 18° above W
Monday Sep 20, 2021 7:53 PM 6 min 40° 10° above SW 10° above ENE
Monday Sep 20, 2021 9:30 PM 3 min 61° 10° above W 61° above NW
Tuesday Sep 21, 2021 8:43 PM 5 min 81° 10° above WSW 31° above ENE
Tuesday Sep 21, 2021 10:20 PM 1 min 16° 10° above WNW 16° above WNW
Wednesday Sep 22, 2021 7:56 PM 7 min 80° 10° above WSW 11° above ENE
Wednesday Sep 22, 2021 9:33 PM 3 min 48° 10° above W 48° above NW
Thursday Sep 23, 2021 8:46 PM 5 min 60° 10° above W 33° above ENE
Thursday Sep 23, 2021 10:23 PM 1 min 14° 10° above WNW 14° above WNW
Friday Sep 24, 2021 7:59 PM 6 min 67° 10° above W 13° above ENE
Friday Sep 24, 2021 9:36 PM 2 min 37° 10° above WNW 37° above WNW
Saturday Sep 25, 2021 8:49 PM 4 min 58° 10° above WNW 44° above NE
Saturday Sep 25, 2021 10:25 PM < 1 min 12° 10° above WNW 12° above WNW
Sunday Sep 26, 2021 8:01 PM 6 min 57° 10° above W 16° above ENE
Sunday Sep 26, 2021 9:38 PM 2 min 33° 10° above WNW 33° above WNW
* Flyovers that will reach a Max Height of at least 40°, provide the best chance for a sighting opportunity because they are visible above most landscapes and buildings.

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.

Heavens Above

The link, left, will take you directly 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.

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 by clicking on the map below.

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Also see: NASA ISS sighting information for Guernsey.