They put a weather satellite into orbit about the earth.

他们把一颗气象卫星送入环绕地球的轨道。

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Planetary perturbations make the earth's orbit about the sun irregular.

行星的摄动使得地球绕太阳的轨道是不规则的。

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"For the first time in history, a scientific observatory is in orbit about our solar system's innermost planet, " he said.

Sean Solomon说：“这是历史上第一次在太阳系最内的行星的轨道上进行科学观测。

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Knowing more about how the Yarkovsky effect changes an asteroid's orbit will help scientists better predict whether RQ36 will come near Earth.

VOA: special.2011.06.22

The next Royal Astronomer, Edmund Halley, spent another forty years gathering information about the moon's orbit.

VOA: special.2010.07.14

The planet's orbit lies about four billion five hundred million kilometers from the sun.

VOA: special.2011.07.27

Certainly, statistical analyses would suggest there are very many stars out there with terrestrial bodies in orbit about them.

BBC: Star 'eats' a planet

Dr Murray stressed there was no direct evidence these stars did have Earth-sized planets in orbit about them, but modelling had shown that if sufficient terrestrial material existed in a system it would eventually clump together into bodies as big as the Earth.

BBC: 'Hungry' stars reveal planet presence

The satellites would remain in orbit for about 45 days.

FORBES: Move Over, Drones - Here Come Disposable Satellites