You got to realize that.

你得承认
It's a tremendous leap of faith

这是一次信仰的巨大飞跃
to believe that the laws that are operative near the surface of the Earth

去接受在地球表面成立的定律
also apply to the Moon and also apply to the planets.

对月球以及行星也适用这个事实
This was the year 1600-and-something,

定律大概是在 1600 年左右发现的
there was witchcraft and people had all kinds of superstitions.

还是个巫术流行的充满各种迷信的时代
People were not even thinking in scientific ways.

人们甚至不用科学的方式思考
There were a lot of illusions about what the heavens are made of.

充斥着对于天堂的各种幻想
To believe they're made up of similar stuff

要相信天堂物质的基本构成跟地面相似
and controlled by the same laws,

运动遵循同一规律
that's very obvious now

虽然如今看来是显而易见
but it was very far from obvious in those days.

但在当时是不可想象的