19.5 degrees north and south are the latitudeswhere the apex points of a star tetrahedra within a sphere will contact that sphere's surface,when one apex is positioned at the north or south pole.
19.5 degrees is the angle that's been found by researchers (Richard C. Hoagland, Stanley McDaniel, Erol Torun, Horace W. Crater, etc.) to be repeatedly encoded in the structures of Cydonia. It is viewed as a definite 'signal in the noise' - some kind of a 'message' left there by some intelligence. 19.5 is called t, the 'tetrahedral constant', because of its significance in tetrahedral geometry (a tetrahedron is a pyramid shape composed of four equilateral triangular sides): the apexes of a tetrahedron when placed within a circumscribing sphere, one of the tetrahedron's apexes touching the north pole, the other three apexes touch the surface of the sphere at 19.5 degrees south latitude. Why this number would be important to the builders of the Martian structures is not clear (though Hoagland is theorizing that it has to do with what he calls "hyperdimensional physics"). mmm... there's a mouth full...
Read the details here, I kindly borrowed a brief : http://www.vortexmaps.com/planets.php
Here is more interesting information about 19.5 degree...
|The Sun||Sunspot activity and the region|
of peak temperatures is limited to 19.5° North and South.
|Venus||The presumably active major|
volcano complexes Alpha and Beta Regio are near 19.5°.
|Mars||The vast Olympus Mons shield|
cone volcano is at 19.5°.
|Jupiter||The red spot is at 19.5°.|
|Neptune||In 1986 Voyager II discovered a|
similar spot at 19.5°.
Borrowed from here... http://www.heartoftheinitiate.com/library/articles/davinci-code-2-mystery-of-the-pyramids
and so here is my point about this glorious number...
13 x 13 = 169
13 + 13 = 26
169 + 26 = 195... and we all know how to move a decimal right? ;)