许天文
Xu Tianwen
以上为机器翻译结果，长、整句建议使用 人工翻译 。
鲍迪许：美国数学家和天文学家，因在航海方面的著作而闻名。
Bowditch: American mathematician and astronomer noted for his works concerning navigation.
youdao
许衡领导制订的《授时历》代表了元代的天文学方面的科技水平。
Furthermore, worked out under his instructions represented the scientific and technological level achieved by Yuan dynasty in astronomy.
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