Now in order to explain the motion of Venus in the sky, it's a bit more of a problem, you see Venus as we know now is closer to the sun that the earth is.

接下来想要解释，金星在天空中的运动就比较麻烦了，据我们所知相比其地球来说，金星离太阳更近。

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Astronauts look weightless because they are in continuous freefall towards the Earth, staying aloft because of their horizontal motion.

宇航员表明上看起来是失重的，那是因为他们在不停地往地球方向做自由落体运动，而他们在水平方向上的运动又使他们保持着漂浮的状态。

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this made it eventually possible to assume that the motion of the moon and the fall of a body on earth could be governed by the same law of gravitation.

由此就可以假定月球的运动以及物体的落地都受同样的引力规律控制。

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"It's a horizontal motion of two pieces of the Earth's crust on either side of a vertical crack in the Earth,"

VOA: standard.2010.01.13

According to tectonic theory, the surface of the Earth is made up of a patchwork of massive rigid plates, about 80km (50 miles) thick, which float in slow motion on top of the Earth's hot, pliable interior.

BBC: The Pacific 'Ring of Fire'

Compared with the sluggish air on Earth, the Martian atmosphere is in constant motion: between the surface and six feet above it, temperatures can vary by as much as sixty degrees.

NEWYORKER: The Martian Chroniclers

Google Earth 7.1 includes support for Leap Motion.

FORBES: A Hand-Controlled Flight Simulator, Brought To You By Leap Motion And Google Earth