TIWANAKU. OCTAGON. Rotating pentagram, we found that Great Zimbabwe (GZ), Angkor and the Tiwanaku lie on the same line, which interacts with azimuth of Teotihuacan.
In this position when octagon is oriented along cardinal points, we see that the line GZAngkor Tiwanaku coincides with the axis of octagon, the value of which is 112.5 *.
In the case of GZ the error is 0.34 *, and in case of Angkor 0.15 *.
We can also see that the Easter island and MohenjoDaro with Tiwanaku also lie on the same line, with the error of 0.2 *. This line in its turn coincides with the axis of octagon  67.5 / 247.5 *.
In case of Easter island the error is 0.35 *, and in case of Mohenjo Daro 0.29 *.
Thus, the angle between two lines is close to 45 *, and they are symmetrical relatively to the cardinal points.
The exact angles between the directions are: Between azimuths of Easter Island and GZ  134.99 * (0.01 *). Between azimuths of Easter island and Angkor  134.8 * (0.2 *). Between azimuths of MohenjoDaro and GZ  44.95 * (0.05 *). Between azimuths of MohenjoDaro and Angkor  45.14 * (+ 0.14 *).
