perihelion 的定义
plural per·i·he·li·a [per-uh-hee-lee-uh, -heel-yuh]. /ˌpɛr əˈhi li ə, -ˈhil yə/. Astronomy.
- the point in the orbit of a planet or comet at which it is nearest to the sun.
更多perihelion例句
- I'm not trying to calculate the perihelion of Jupiter or do 3D renderings of the National Cathedral.
- The direction of the axis major of the orbit, which was found by calculating the longitude of the comet's perihelion.
- The comet returned at the appointed time; and on the 12th of March, 1759, reached its perihelion.
- At its perihelion it travels thousands of leagues per minute; at its aphelion it does not pass over more than a few yards.
- The only sensible effect will be a secular motion of the perihelion.
- The motion of Mercury's perihelion would therefore be 7´´ in the theory of Lorentz and 5´´.6 in that of Abraham.