aphelion

n.

远日点；

复数：aphelia

1. Otherwise difficult to notice, the change in the Sun's apparent diameter between Perihelion and Aphelion is clear.
   我们很难用肉眼看出近日点和远日点太阳视直径的变化，但在这张图上显而易见。

APHELION
New near-aphelion light curves of Comet 2P/Encke
Near-aphelion CCD photometry of Comet P/S Schwassmann-Wachmann 2
Aphelion Clustering of ``New'' Comets: Star Tracks through Oort's Cloud
(2060) Chiron: Evidence for Activity near Aphelion
The Dust Trail of Comet Churyumov-Gerasimenko Near Aphelion
Water Vapor Saturation at Low Altitudes around Mars Aphelion: A Key to Mars Climate?
Mapping of Ozone and Water in the Atmosphere of Mars near the 1997 Aphelion
Mars ozone measurements near the 1995 aphelion: Hubble space telescope ultraviolet spectroscopy with the faint object spectrograph
Hubble Space Telescope observations of the Martian aphelion cloud belt prior to the Pathfinder mission: Seasonal and interannual var...