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Glossary term: Conjonction

Description: Du point de vue d'un observateur sur Terre, lorsque deux objets astronomiques semblent se trouver à proximité dans le ciel, on dit qu'ils sont en conjonction. Il n'est pas nécessaire que la conjonction soit réellement visible - par exemple, la Lune et le Soleil sont approximativement alignés chaque fois qu'il y a une nouvelle Lune, mais nous ne pouvons pas voir la Lune dans ces conditions, à moins qu'il n'y ait une éclipse solaire. Dans ce cas, et lorsqu'une conjonction est si proche qu'un objet semble recouvrir l'autre, les astronomes parlent de transit ou d'éclipse.

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Term and definition status: The original definition of this term in English have been approved by a research astronomer and a teacher
The translation of this term and its definition have been approved by a research astronomer and a teacher

The OAE Multilingual Glossary is a project of the IAU Office of Astronomy for Education (OAE) in collaboration with the IAU Office of Astronomy Outreach (OAO). The terms and definitions were chosen, written and reviewed by a collective effort from the OAE, the OAE Centers and Nodes, the OAE National Astronomy Education Coordinators (NAECs) and other volunteers. You can find a full list of credits here. All glossary terms and their definitions are released under a Creative Commons CC BY-4.0 license and should be credited to "IAU OAE".

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Three bright objects in the sky with one top left, one in the middle and one lower centre.

Jupiter, Venus, Moon Conjunction

Caption: Captured with a smartphone in February 2023, over the skies of Luzerne County, Pennsylvania, USA, this photograph offers a glimpse into a conjunction, an enthralling astronomical phenomenon that occurs when two or more celestial objects are seen in close proximity in the sky from our perspective, despite the objects not being physically near to each other. In this image, the brilliance of Jupiter (top), the allure of Venus (middle), and the familiar glow of our Moon (bottom) dance together against a backdrop of delicate clouds and a treeline silhouette, making it a moment worth treasuring.
Credit: Joslynn Appel/IAU OAE (CC BY 4.0)

License: CC-BY-4.0 Creative Commons Attribution 4.0 International (CC BY 4.0) icons