apex


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apex

1. the highest point; vertex
2. Astronomy the point on the celestial sphere, lying in the constellation Hercules, towards which the sun appears to move at a velocity of 20 kilometres per second relative to the nearest stars

apex

1. (solar apex) The point on the celestial sphere toward which the Sun and the Solar System are moving relative to the stars in our vicinity. The apex lies in the constellation Hercules at a position RA 18h, dec +30°, close to the star Vega. The point diametrically opposite to the direction of this relative solar motion is the antapex (or solar antapex); it lies in the constellation Columba. The position of the apex can be determined from an analysis of the proper motions, radial velocities, and parallaxes of stars, based on the assumption that solar motion is equal and opposite to the group motion of stars. The velocity of this motion has been calculated as about 19.5 km s–1 with respect to the local standard of rest, when all available information on proper motion and radial velocity is used. The value is lower when only the stars in the Sun's immediate neighborhood are considered. Solar motion produces the secular parallax of stars.
2. The point on the celestial sphere toward which the Earth appears to be moving, at a given time, as a result of its orbital motion around the Sun.

Apex

The highest point, peak, or tip of any structure.

apex

[′ā‚peks]
(anatomy)
The upper portion of a lung extending into the root.
The pointed end of the heart.
The tip of the root of a tooth.
(botany)
The pointed tip of a leaf.
(engineering)
In architecture or construction, the highest point, peak, or tip of any structure.
(geology)
The part of a mineral vein nearest the surface of the earth.
(mathematics)
The vertex of a triangle opposite the side which is regarded as the base.
The vertex of a cone or pyramid.

apex

In architecture or construction, the highest point, peak, or tip of any structure.

apex

apexclick for a larger image
Top-center portion of a parachute canopy where suspension lines cross.
References in classic literature ?
Beyond the pit stood the little wedge of people with the white flag at its apex, arrested by these phenomena, a little knot of small vertical black shapes upon the black ground.
This apex of the entertainment happily reached, Mr.
Form the balance of the battleships into a great V with the apex pointing directly south-south-east.
A lesser ladder still ascended to a tinier trap-door in the apex of the tower; the fixed seats looked to me to be wearing their old, old coat of grained varnish; nay the varnish had its ancient smell, and the very vanes outside creaked their message to my ears.
Clopin Trouillefou had placed himself at the apex with the Duke of Egypt, our friend Jehan, and the most daring of the scavengers.
Just at these steps the group paused, as though it feared to proceed further; but very quickly one of the three ladies, who formed its apex, stepped forward into the charmed circle, followed by two members of her suite.
The airships lined out as they moved forward into the form of a flattened V, with its apex towards the city, and with the flagship going highest at the apex.
A military organization may be quite correctly compared to a cone, of which the base with the largest diameter consists of the rank and file; the next higher and smaller section of the cone consists of the next higher grades of the army, and so on to the apex, the point of which will represent the commander in chief.
Bearded and gray was Manu, the monkey, and to his dim old eyes came the fire of recollection of those days when Tarzan of the Apes had ruled supreme, Lord of the Jungle, over all the myriad life that trod the matted vegetation between the boles of the great trees, or flew or swung or climbed in the leafy fastness upward to the very apex of the loftiest terraces.
They, in the auto, were coming down Market with the intention of negotiating the sharp apex and going up Geary.
Backward, from the apex, his head slanted down to his neck and forward it slanted uncompromisingly to meet a low and remarkably wide forehead.
The roof ran up to an apex, and was evidently the inner shell of the true roof of the house.