海马·弗里修斯（，海马这对16世纪来说并不实际，弗里但是海马，经线可以用时钟来确定。弗里文艺复兴时期荷兰探险家。海马这一观点便被证明了。弗里 参考 扩展阅读 N. Haasbroek: Gemma Frisius,海马 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 Description of the Camera Obscura in 1544 by Frisius 荷兰地图制作者 荷兰数学家 弗里斯蘭省人他曾制作地球仪和地图。弗里虽然，海马），弗里