The starry sky in September 2025
After the bright summer nights, it gets dark much earlier again in September. Most of the constellations can already be seen at around 21:30. First to fall vertically above us is the bright star Away up. If you look there again later, when it has become completely dark, you will also see the small diamond-shaped constellation Lyre in which Vega is the brightest star. If you do not see Lyra, you may not have seen Vega, but perhaps the star Atair (constellation Eagle) or Deneb (constellation Swan) in their sights. Vega, Atair and Deneb together form a large triangle called the "summer triangle". In the middle of the summer triangle and slightly to the left of it are the small constellations Arrow and Dolphin. Neither of them have any bright stars, but because they are so small, their figures stand out at first glance. Now the Milky Way as a pale, shimmering band high above our heads. Both the western part of the sky with the setting early summer constellations and the eastern sky with the rising autumn constellations are poor in bright stars. In the constellation of Pisces Saturn and right next door you can Neptune observe.
On September 7, a total Lunar eclipse takes place. The moon is already eclipsed above the eastern horizon in Central Europe. By the end of totality at 20:53, it is just under ten degrees above the horizon. At 21:57, the moon leaves the Earth's umbra again. See also the point Events on our homepage.
The moon phases in September 2025
The planets in September 2025
Mercury is not observable in September.
Venus is on its way south along the ecliptic. It runs from the constellation of Cancer to the constellation of Leo. We can still see Venus as a bright morning star. On 19.9. it is directly next to the main star Regulus and the crescent moon is just in front of Venus. In the afternoon of September 19, the moon will cover Venus in the daytime sky.
Mars passes through the constellation of Virgo, but this remains hidden in the bright sunshine.
Jupiter in the constellation of Gemini rises at midnight. On 16.9. the waning moon is close to Jupiter.
Saturn reaches its opposition this year on 21.9. It rises in the evening, is in the south at midnight and sets in the morning. On September 8/9, the full moon will pass Saturn. We are currently looking almost exactly at the edge of Saturn's rings. There will also be interesting events involving Saturn's moons with transits in front of the planet's disk and shadows cast.
Uranus in the constellation of Taurus now rises in the early evening hours, and it is worth observing it with binoculars from around midnight.
Neptune reaches this year's opposition to the sun on September 23. The distant planet is currently in the constellation of Pisces. To see it, you need good binoculars or a telescope.
In a slightly modified form from The starry sky in September 2025 - Vereinigung der Sternfreunde e.V.