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古希腊的天文学家为了编制历法,对太阳和月球的运动周期已经有了比较详细的了解．他们已经知道,在太阳运转一周所需要的时间内(即 1年),月球要绕地球12周再加上些零头,因此在制定历法时有的年份是12个月,有的年份是13个月(即阴历中的闰年)．活跃于公元前 425年的默冬提出,19年包含235个月．因此,在每19年中,12个月的年份将有12个,13个月的年份将有7个．晚默冬100多年的古希腊天文学家阿里斯塔克根据太阳、月球的运动规律巧妙地计算出了太阳、月球之间的距离和地球、月球之间的距离
For the preparation of the calendar, ancient Greek astronomers had a more detailed understanding of the cycle of the sun and the moon. They already knew that in the time required for the sun to run a week (that is, 1 year), the moon must add a fraction of the earth’s 12 weeks. Therefore, when the calendar was established, some years were 12 months, and some years were 13 Month (the leap year in the lunar calendar). Meudong active in 425 BC proposed that 19 years contain 235 months. Therefore, in every 19 years, there will be 12 in 12 months and 7 in 13 months. According to the laws of the sun and the moon, the ancient Greek astronomer Aristarch, who was a late 100-year-old Mithranian Greek, calculated the distance between the sun and the moon and the distance between the earth and the moon.