{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,20]],"date-time":"2026-08-20T15:33:30Z","timestamp":1787240010344,"version":"build-2736575974"},"reference-count":0,"publisher":"Society for Industrial & Applied Mathematics (SIAM)","issue":"4","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["SIAM Rev."],"published-print":{"date-parts":[[1991,12]]},"abstract":"<jats:p>In this note a simple and sometimes practical method is devised with which the average speed and the cruising altitude of an aircraft in flight can be computed from a window seat inside the aircraft. No knowledge of the mechanical structure of the vehicle is assumed. Rather, either two separate time measurements or a time and a length measurement are used allowing one to construct sets of similar triangles. These triangles can then be used to derive the formulas for speed and altitude. This method can also be used to determine the average speed of moving ground vehicles such as trains and buses.<\/jats:p>","DOI":"10.1137\/1033139","type":"journal-article","created":{"date-parts":[[2005,3,7]],"date-time":"2005-03-07T02:21:47Z","timestamp":1110162107000},"page":"650-654","source":"Crossref","is-referenced-by-count":0,"title":["Measuring the Speed and Altitude of an Aircraft Using Similar Triangles"],"prefix":"10.1137","volume":"33","author":[{"given":"Hassan","family":"Sedaghat","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"351","published-online":{"date-parts":[[2006,7,18]]},"container-title":["SIAM Review"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/epubs.siam.org\/doi\/pdf\/10.1137\/1033139","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2026,8,20]],"date-time":"2026-08-20T15:14:32Z","timestamp":1787238872000},"score":1,"resource":{"primary":{"URL":"https:\/\/epubs.siam.org\/doi\/10.1137\/1033139"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[1991,12]]},"references-count":0,"journal-issue":{"issue":"4","published-print":{"date-parts":[[1991,12]]}},"alternative-id":["10.1137\/1033139"],"URL":"https:\/\/doi.org\/10.1137\/1033139","relation":{},"ISSN":["0036-1445","1095-7200"],"issn-type":[{"value":"0036-1445","type":"print"},{"value":"1095-7200","type":"electronic"}],"subject":[],"published":{"date-parts":[[1991,12]]}}}