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Webster 1913 Edition

(k?r-t?′sh?n)

Noun.

(Astron.)

The interval by which the curtate distance of a planet is less than the true distance.

Noun.

[See Curtate.] The interval between a planets distance from the sun and the curtate distance.

curtation ‎(plural curtations)

(astronomy) The interval of a planets orbit in which its curtate or shortened distance is less than the true distance.

interval of a planets distance