Glossary term: Cadran solaire
Description: La position du Soleil dans le ciel a longtemps été utilisée pour définir le temps, le midi local étant le point où le Soleil est le plus haut au-dessus de l'horizon, et le jour étant défini au sens strict comme la période entre le lever et le coucher du Soleil, et au sens large comme le temps écoulé entre un midi local et le suivant. Un cadran solaire est un dispositif qui projette la direction du soleil sur une surface marquée, généralement en suivant l'ombre d'un pointeur allongé appelé "gnomon". Lorsque cette ombre pointe sur le repère "12", par exemple, il est 12 heures. Les cadrans solaires simples n'indiquent que l'heure solaire apparente, qui est directement liée à la position du soleil dans le ciel. Des versions plus élaborées comportent des dispositions particulières permettant de déterminer le temps solaire moyen.
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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 is still awaiting approval
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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