海马·弗里修斯

海马·弗里修斯（，），文艺复兴时期荷兰探险家。他曾制作地球仪和地图。他在其论著《天文学和制图学原理》书中提出，经线可以用时钟来确定。虽然，这对16世纪来说并不实际，但是，当发明了非常精确的便携式时钟后，这一观点便被证明了。

参考
扩展阅读

• N. Haasbroek: [https://web.archive.org/web/20110722200119/http://www.ncg.knaw.nl/Publicaties/Groen/pdf/14Haasbroek.pdf Gemma Frisius, Tycho Brahe and Snellius and their triangulations]. Delft 1968.
• Robert Haardt: The globe of Gemma Frisius. Imago mundi, Bd. 9, 1952.
• W. Karrow: Mapmakers of the Sixteenth Century and Their Maps. Chicago 1993.
• G. Kish: Medicina, mensura, mathematica: The Life and Works of Gemma Frisius. Minneapolis 1967, sowie sein Artikel in Dictionary of Scientific Biography
• A. Pogo: Gemma Frisius, his method of determining longitude. In: Isis. Bd. 22, 1935, S.469-485.

外部链接
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• [https://pandora.nla.gov.au/pan/13071/20040303-0000/www.acmi.net.au/AIC/CAM_OBS_LOUVAIN_1544.GIF Description of the Camera Obscura in 1544 by Frisius]