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 Sunday 02nd May 2021

The following ISS sightings are possible from Saturday 1st May 2021 through to Tuesday 11th May 2021

DATE VISIBLE MAX HEIGHT* APPEARS DISAPPEARS
Saturday May 1, 2021 4:04 AM 4 min 32° 26° above S 10° above E
Sunday May 2, 2021 3:18 AM 2 min 21° 21° above SE 10° above E
Sunday May 2, 2021 4:51 AM 7 min 87° 12° above WSW 10° above ENE
Monday May 3, 2021 2:32 AM < 1 min 11° 11° above ESE 10° above E
Monday May 3, 2021 4:05 AM 5 min 66° 28° above SW 10° above ENE
Tuesday May 4, 2021 3:20 AM 3 min 47° 47° above SSE 10° above ENE
Tuesday May 4, 2021 4:53 AM 7 min 64° 10° above W 10° above ENE
Wednesday May 5, 2021 2:34 AM 2 min 22° 22° above E 10° above E
Wednesday May 5, 2021 4:07 AM 6 min 75° 21° above W 10° above ENE
Thursday May 6, 2021 3:21 AM 4 min 87° 56° above WSW 10° above ENE
Thursday May 6, 2021 4:55 AM 7 min 57° 10° above W 10° above E
Friday May 7, 2021 2:35 AM 3 min 48° 48° above E 10° above ENE
Friday May 7, 2021 4:08 AM 6 min 58° 12° above W 10° above ENE
Saturday May 8, 2021 1:49 AM 1 min 18° 18° above E 10° above ENE
Saturday May 8, 2021 3:22 AM 5 min 64° 28° above W 10° above ENE
Sunday May 9, 2021 2:36 AM 4 min 75° 73° above NW 10° above ENE
Sunday May 9, 2021 4:10 AM 7 min 59° 10° above WNW 10° above E
Monday May 10, 2021 1:50 AM 2 min 36° 36° above ENE 10° above ENE
Monday May 10, 2021 3:23 AM 6 min 57° 14° above WNW 10° above E
Tuesday May 11, 2021 1:04 AM 1 min 14° 14° above ENE 10° above ENE
* 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.