.mw-parser-output .hidden-begin{box-sizing:border-box;width:100%;padding:5px;border:none;font-size:95%}.mw-parser-output .hidden-title{font-weight:bold;line-height:1.6;text-align:left}.mw-parser-output .hidden-content{text-align:left}You can help expand this article with text translated from the corresponding article in French. (April 2023) Click [show] for important translation instructions. Machine translation, like DeepL or Google Translate, is a useful starting point for translations, but translators must revise errors as necessary and confirm that the translation is accurate, rather than simply copy-pasting machine-translated text into the English Wikipedia. Do not translate text that appears unreliable or low-quality. If possible, verify the text with references provided in the foreign-language article. You must provide copyright attribution in the edit summary accompanying your translation by providing an interlanguage link to the source of your translation. A model attribution edit summary is Content in this edit is translated from the existing French Wikipedia article at [[:fr:Jean Mathieu de Chazelles]]; see its history for attribution. You should also add the template ((Translated|fr|Jean Mathieu de Chazelles)) to the talk page. For more guidance, see Wikipedia:Translation.
Jean Mathieu de Chazelles
Born(1657-07-24)24 July 1657
Lyon
Died16 January 1710(1710-01-16) (aged 52)
Paris
Known forMeasuring the Pyramids
AwardsMember of the French Academy of Sciences
Scientific career
FieldsHydrography
InstitutionsMarseilles
Notable studentsLouis Feuillée

Jean Mathieu de Chazelles (24 July 1657 – 16 January 1710) was a French hydrographer born in Lyon.

He was nominated professor of hydrography at Marseilles in 1685, and in that capacity carried out various coast surveys. In 1693 he was engaged to publish a second volume of the Neptune français, which was to, include the hydrography of the Mediterranean. For this purpose he visited the Levant and Egypt. When in Egypt he measured the pyramids, and, finding that the angles formed by the sides of the largest were in the direction of the four cardinal points, he concluded that this position must have been intended, and also that the poles of the earth and meridians had not deviated since the erection of those structures. He was made a member of the Academy in 1695, and died in Paris on 16 January 1710.

The botanist and explorer Louis Feuillée was one of his pupils.

 This article incorporates text from a publication now in the public domain: Chisholm, Hugh, ed. (1911). "Chazelles, Jean Mathieu de". Encyclopædia Britannica (11th ed.). Cambridge University Press.

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