Tonight, Sept. 22, 2025, we officially say goodbye to summer! In fact, the important event of the autumnal equinox marks the transition from summer to autumn, with the Sun equally illuminating the planet by having 12 hours of light and 12 hours of darkness. Equinox means night equals day.
The date may vary each year, between September 21 and 24.
The spectacular Saturn and other planets: this evening
Saturn after opposition to the Sun on Sept. 21 will be visible throughout the night at its brightest. This planet is clearly visible in the night sky, peaking to the south in the central hours of the night. Venus is the second planet in the solar system by distance from the Sun. It is visible from Earth only in the vicinity of the Sun, before sunrise (about 2 hours), looking eastward. The Star Walk app can help you spot them.
Neptune‘s observable conditions, as Unione Astrofili Italiani informs, are identical to those of Saturn. Both are in the constellation Pisces. Neptune goes into opposition with retrograde motion on Sept. 23. Use of a telescope is required to observe it.
Jupiter turns out to be visible late at night, in the second part of the night to be precise on the horizon to the east, southeast. Mars, on the other hand, turns out to be hardly visible after sunset (it should be looked for towards the west). Uranus can also be observed on the horizon late at night with the help of a telescope in the constellation Taurus. Then if you turn your gaze south, you can see Pluto, also not observable with the naked eye.
So, in summary, Jupiter, Saturn and Venus can be seen even without the use of a telescope, it is useful to use the app to orient yourself in the sky, it is not easy (for the inexperienced), to locate the constellations and planets. The telescope makes the show even more interesting.