小时[Hour] - 达人(其实～我是卧底，来自外星)

5D艺术网首页商城 | 资讯 | 作品 | 博客 | 教程 | 论坛

2004/12/08 | 小时[Hour]
类别(¤〖天文〗) | 评论(0) | 阅读(34) | 发表于 12:42: A unit of time of which 24 comprise a solar day. The Egyptians were the first to so divide the day, although the lengths of each of the hours in a day was not a fixed number to the Egyptians and changed with the seasons. In their investigation of theoretical astronomy, the Greeks used "equinoctial" hours of equal length, and divided these hours into 60 minutes (Neugebauer 1969).; 0