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1. Oxford Dictionary

   perihelion

   • IPA[ˌpɛrɪˈhiːlɪən]

   英式

   • n.
     the point in the orbit of a planet, asteroid, or comet at which it is closest to the sun

   • noun: perihelion, plural noun: perihelia

2. • 釋義

   n.

   名詞

   • 1. the point in the orbit of a planet, asteroid, or comet at which it is closest to the sun today Mercury is at perihelion
3. • 更多解釋

   perihelion

   • IPA[ˌperəˈhēlyən]

   美式

   • n.
     the point in the orbit of a planet, asteroid, or comet at which it is closest to the sun: today Mercury is at perihelion

   Oxford American Dictionary