Editing Hypocycloid (section)

==History==

The 2-cusped hypocycloid called [[Tusi couple]] was first described by the 13th-century [[Persian people|Persian]] [[Islamic astronomy|astronomer]] and [[Islamic mathematics|mathematician]] [[Nasir al-Din al-Tusi]] in ''Tahrir al-Majisti (Commentary on the Almagest)''.<ref>{{Cite web |last=Weisstein |first=Eric W. |title=Tusi Couple |url=https://mathworld.wolfram.com/ |access-date=2023-02-27 |website=mathworld.wolfram.com |language=en}}</ref><ref>{{Cite book |last=Blake |first=Stephen P. |url=https://books.google.com/books?id=3dJVDwAAQBAJ&dq=Tusi+couple+al+majisti&pg=PA67 |title=Astronomy and Astrology in the Islamic World |date=2016-04-08 |publisher=Edinburgh University Press |isbn=978-0-7486-4911-2 |language=en}}</ref> German painter and German Renaissance theorist [[Albrecht Dürer]] described [[epitrochoid]]s in 1525, and later Roemer and Bernoulli concentrated on some specific hypocycloids, like the astroid, in 1674 and 1691, respectively.<ref name=":1" />