line of apsides

American  

noun

Astronomy.

1. the major axis of an elliptical orbit.

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Example Sentences

Change of line of apsides; period about 21,000 years.

From Project Gutenberg

The more distant is called the higher apsis; the other, the lower apsis; and the line joining them, the line of apsides.

From Project Gutenberg

The “line of apsides” is that which joins them, forming the major axis of the orbit.

From Project Gutenberg

That is to say, he assumed a revolving line of apsides in an elliptical orbit traversed by a pretty strongly compressed pair of globes.

From Project Gutenberg

The time of revolution of a primary or secondary planet in reference to its line of apsides; that is, from one perigee or apogee to another.

From Project Gutenberg