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aphelion
a p h e l i o n hex:#97;#112;#104;#101;#108;#105;#111;#110;
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- Aphelion - n. - That point of a planet's or comet's orbit which is most distant from the sun, the opposite point being the perihelion.
- Apsis - n. - One of the two points of an orbit, as of a planet or satellite, which are at the greatest and least distance from the central body, corresponding to the aphelion and perihelion of a planet, or to the apogee and perigee of the moon. The more distant is called the higher apsis; the other, the lower apsis; and the line joining them, the line of apsides.