The Collaborative International Dictionary
Apex of the earth's motion
Apex \A"pex\, n.; pl. E. Apexes; L. Apices. [L.]
The tip, top, point, or angular summit of anything; as, the apex of a mountain, spire, or cone; the apex, or tip, of a leaf.
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(Mining) The end or edge of a vein nearest the surface.
Apex of the earth's motion (Astron.), that point of the heavens toward which the earth is moving in its orbit.