Karen , There are no mentions in the text on the Machu Pichu page of the imaginary lines that are supposed to be pointing to other sites hundreds or thousands of miles away , as found on many of the other pages .
However there are problems with the text on that particular page e.g. “coincidentally the ridges direction almost equals the angle of declination of the earths axis “ This angle changes annually from +23.45 degrees to – 23.45 degrees while the ridge obviously remains the same and being natural does vary i.e. it is not a straight line . When the declination is either -23.45 or +23.45 at the solstices the bearings to these events are approx 65 and 245 degrees which are nothing like the suggested orientation of the ridge (337.83 ) .Further he is mixing up the degrees of declination with ordinary degrees of azimuth , they are not the same i.e. 1 degree of declination is nearly double one degree of azimuth .
When making a simple alignment towards a solstice you need not have any knowledge of astronomy or obliquity of the ecliptic ,all you do is wait until the sun sets at it's most extreme points .That bearing when investigated with contemporary concepts is related to latitude and the extreme value for obliquity as well as measure in degrees .Those that made the did the simple job of marking where the suns et or rose need not know the value any of these three relatively modern concepts,any more than they needed to how far away they were or the speed of light .