And the visible and invisible colors of the universe
Outdoor :
Enjoy the absence of light pollution and the clear nights in the Petit Buëch valley to live a sensorial experience in connection with the cosmos.
Exploration of the sky / Initiation to observation
These two activities are generally processed together in an activity.
Indoor :Â
Les pieds sur Terre, le regard vers les Ă©toiles... et au-delĂ !
September, the month of the autumn equinox
In 2026, the autumn equinox occurs on September 23 at 00:05.
The equinox days are the only two days of the year on which the Sun rises exactly to the east and sets exactly to the west... all over the Earth. Day and night have the same duration.
In the sky
The sun is at the beginning of the month in front of the constellation of Leo and in front of that of Virgo at the end of the month.
Venus, the Shepherd’s Star, still shines above the western horizon in front of the constellation of Virgo, the first celestial body visible after sunset. It reaches its greatest brightness on September 21 after passing its aphelion on September 4.
Saturn and Neptune are in front of the constellation of Pisces. Neptune is not visible to the naked eye. They are visited by the full Moon on September 26, the day of Neptune’s opposition with the Sun.
The Summer Triangle is always in the sky at the beginning of night.
September, the month of the Mid-Autumn Festival
- In China, the Mid-Autumn Festival, or Moon Festival, takes place on Friday, September 25.
- In Japan, this same festival is called "Tsukimi", and has as its symbol a white rabbit
Picture related with radioastronomy, Ă©dited by the National Radio Astronomy Observatory
Read more (NRAO site)Image or photograph related to astronomy edited by the NASA, along with a brief explanation.
Read more (NASA site)
Image created from observations of the Chandra space telescope in X-ray (NASA / Smithsonian Astronomical Observatory)
Read more (Chandra site)We are here to answer your questions.
