【英语时差8,16】如何计算光速2

 Then, in 1676, a Danish astronomer¹ named Ole Roemer saw something interesting in the sky. He was watching the moons of Jupiter go around — something fairly easy to see even with a primitive² telescope. He started marking down the exact times when one moon went behind Jupiter and when it came back into view again. To his amazement³ he found that these eclipses occurred later and later as the year went on. Can you guess why? Roemer correctly concluded that Jupiter’s orbit took it farther away from the earth at some parts of the year. Because it took time for light to travel from the moons to Roemer’s telescope, the farther away they were, the later the eclipses seemed to be taking place! Roemer’s observations were among the first to demonstrate that light does indeed take time to travel.

1 astronomer   

n.天文学家

参考例句：

• A new star attracted the notice of the astronomer.新发现的一颗星引起了那位天文学家的注意。
• He is reputed to have been a good astronomer.他以一个优秀的天文学者闻名于世。

2 primitive   

adj.原始的；简单的；n.原(始)人，原始事物

参考例句：

• It is a primitive instinct to flee a place of danger.逃离危险的地方是一种原始本能。
• His book describes the march of the civilization of a primitive society.他的著作描述了一个原始社会的开化过程。

3 amazement   

n.惊奇，惊讶

参考例句：

• All those around him looked at him with amazement.周围的人都对他投射出惊异的眼光。
• He looked at me in blank amazement.他带着迷茫惊诧的神情望着我。