Either of two corresponding parallels of celestial latitude that are the limits of the apparent northern and southern passages of the sun.

 
  • (天球的)回歸線(xiàn)代表太陽(yáng)經(jīng)過(guò)的最北視界線(xiàn)與最南視界線(xiàn)的兩條相應的天球緯線(xiàn)
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