The anomalistic year is the time between successive transits of the earth through the perihelion . 近点年是地球连续两次通过近日点之间的时间。
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When perigee and perihelion coincide tidal range is at its greatest . 当月球与地球到达它们的近地点和近日点的时间恰好重合时，就会引起最大的潮汐。
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A comet is at perihelion when it is closest ( = very close ) to the sun 彗星最接近太阳时，它就是在近日点。
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Perihelic opposition of mars 火星近日点冲
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Advance of the perihelion 近日点前移
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Advance of perihelion 近日点前移
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If you missed this perihelic opposition of mars , you have to wait until 2287 for an even closer one 错过了这次的火星近日点冲，最快要等到2287年才有另一次更近距离观赏火星的机会了。
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Comet giacobini - zinner passed the perihelion on 3 july this year , it is still relatively close to the earth in october . some astronomers predicted that draconids may be worth watching this year Giacobini - zinner彗星今年在7月3日通过近日点，至10月时与地球尚算接近，因此有天文学家认为今年可能会出现较可观的天座流星雨。
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Draconid meteor shower , associated with comet 21p giacobini - zinner , is not a major meteor showers throughout the year . it approaches the sun every 6 . 61years . if the earth is near the comet s perihelion during that period , a stronger meteor shower may occur 它的母体是21p giacobini - zinner彗星，每6 . 61年回归一次，若当时地球较接近彗星的近日点，便有可能出现较可观的流星雨。
