Rising on March 19, its exact full phase occurred within an hour of perigee, the closest point in the Moon's orbit to Earth.

3月19日那天的月亮，它最圆的相位发生在月球运行到近地点(月球轨道距离地球最近)附近一个小时以内的时间内。

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An analytical method allowing exact reconstruction from cone-beam projection data which are detected from a single circular orbit is discussed.

本文介绍了一种可以对来自于单一圆轨道的锥束投影数据进行精确重建的分析方法。

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However, because of the elliptical orbits of planets, this time period is not equal to an exact 5 calendar years, which is based upon the Earth's orbit around the Sun.

然而，因为行星的椭圆轨道，这一个次时期对精确的5日历数年不是相等的，在太阳的周围基于地球的轨道。

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However, because of the elliptical orbits of planets, this time period is not equal to an exact 5 calendar years, which is based upon the Earth's orbit around the Sun.

然而，因为行星的椭圆轨道，这一个次时期对精确的5日历数年不是相等的，在太阳的周围基于地球的轨道。

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