Corner of the octant

Psalms 118:22  The stone which the builders refused is become the head stone of the corner(6438). 

Job 38:4-6
4  Where wast thou when I laid the foundations of the earth? declare, if thou hast understanding.
5  Who hath laid the measures thereof, if thou knowest? or who hath stretched the line upon it?
6  Whereupon are the foundations thereof fastened? or who laid the corner(6438) stone thereof;

Revelation 7:1  And after these things I saw four angels standing on the four corners of the earth, holding the four winds of the earth, that the wind should not blow on the earth, nor on the sea, nor on any tree.