| 单词 | perihelion |
| 释义 | perihelion —perihelial, perihelian, adj. /per'euh hee"lee euhn, -heel"yeuhn/, n. , pl. perihelia /-hee"lee euh, -heel"yeuh/. Astron. the point in the orbit of a planet or comet at which it is nearest to the sun. Cf. aphelion. See diag. under aphelion. [1660-70; < Gk peri- PERI- + héli(os) sun + -on neut. n. suffix, on the model of PERIGEE; earlier in the NL form perihelium] |
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