A polar stratospheric cloud (PSC) is a cloud that forms in the winter polar stratosphere at altitudes from 15,000 to 25,000 m. They are best observed during civil twilight, when the Sun is between 1° and 6° below the horizon, as well as in winter and in more northerly latitudes. One main type of PSC is composed of mostly supercooled droplets of water and nitric acid and is implicated in the formation of ozone holes. The other main type consists only of ice crystals, which are not harmful. This type of PSC is also called nacreous, due to its iridescence.
"}{"type":"standard","title":"Jacques Dupont (cyclist)","displaytitle":"Jacques Dupont (cyclist)","namespace":{"id":0,"text":""},"wikibase_item":"Q275830","titles":{"canonical":"Jacques_Dupont_(cyclist)","normalized":"Jacques Dupont (cyclist)","display":"Jacques Dupont (cyclist)"},"pageid":18453059,"thumbnail":{"source":"https://upload.wikimedia.org/wikipedia/commons/1/12/Jacques_Dupont%2C_vainqueur_de_Paris-Tours_1951.jpg","width":198,"height":469},"originalimage":{"source":"https://upload.wikimedia.org/wikipedia/commons/1/12/Jacques_Dupont%2C_vainqueur_de_Paris-Tours_1951.jpg","width":198,"height":469},"lang":"en","dir":"ltr","revision":"1278966646","tid":"102481ca-f9f2-11ef-a10c-7a44f1d5a386","timestamp":"2025-03-05T18:45:52Z","description":"French cyclist (1928–2019)","description_source":"local","content_urls":{"desktop":{"page":"https://en.wikipedia.org/wiki/Jacques_Dupont_(cyclist)","revisions":"https://en.wikipedia.org/wiki/Jacques_Dupont_(cyclist)?action=history","edit":"https://en.wikipedia.org/wiki/Jacques_Dupont_(cyclist)?action=edit","talk":"https://en.wikipedia.org/wiki/Talk:Jacques_Dupont_(cyclist)"},"mobile":{"page":"https://en.m.wikipedia.org/wiki/Jacques_Dupont_(cyclist)","revisions":"https://en.m.wikipedia.org/wiki/Special:History/Jacques_Dupont_(cyclist)","edit":"https://en.m.wikipedia.org/wiki/Jacques_Dupont_(cyclist)?action=edit","talk":"https://en.m.wikipedia.org/wiki/Talk:Jacques_Dupont_(cyclist)"}},"extract":"Jacques Dupont was a French racing cyclist and Olympic champion in track cycling. He won a gold medal in the 1000m time trial at the 1948 Summer Olympics in London. He also won a bronze medal in the team road race, together with José Beyaert and Alain Moineau. He won Paris–Tours in 1951 and 1955. He won the 1955 event in what was then a record speed for a professional race covering the 253 km at an average of 43.666 km per hour and being awarded the Ruban Jaune.","extract_html":"
Jacques Dupont was a French racing cyclist and Olympic champion in track cycling. He won a gold medal in the 1000m time trial at the 1948 Summer Olympics in London. He also won a bronze medal in the team road race, together with José Beyaert and Alain Moineau. He won Paris–Tours in 1951 and 1955. He won the 1955 event in what was then a record speed for a professional race covering the 253 km at an average of 43.666 km per hour and being awarded the Ruban Jaune.
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