Further results regarding the Gobekli Tepe star map
With correction for stellar proper motion (Hipparcos catalog) to the presumed date of 2012.97 AD - 2*6339.36 (Julian yr) + 143.91 = 2000.0 AD - 12551.84, and correction of the ecliptic to that date (1990 Astronomical Almanac formula), and adequate approximations giving the local angle between the ecliptic latitude lines and the declination lines, I find that the line from Gamma Corvi to Gamma Crateris should be sloped downward 32 deg, if the horizontal at the Gobekli Tepe Vulture Stone, is the ecliptic latitude line of date. (Ptolemy and other ancient astronomers usually used ecliptic rather than celestial coordinates; ecliptic coords. would be preferred by monument-making astronomers with knowledge of precession.) When I correct the US News&WR photo (see previous post) for an apparent 22 degree rotation of the right side forward (assuming an ordinary 35mm camera with a 50mm focal length and 37mm frame height) I find that about 5% must be added to horizontal dimensions. With this correction, the actual line on the Vulture Stone, from Gamma Corvi to Gamma Crateris, slopes downward 29deg (vs. 32deg predicted).
With the above methods, the line from Gamma Corvi to Theta Crateris, should theoretically slope upward 9deg; on the Vulture Stone, it actually slopes upward about 16deg. The ratios of the lengths,
GammaCorvi GammaCrateris::
GammaCorvi ThetaCrateris::
GammaCrateris ThetaCrateris
theoretically are 1::1.019::0.675, and on the Vulture Stone (with the above correction for perspective) are 1::1.14::0.83. The unusual placement of the "eye" of the upper righthand vulture (Theta Crateris) suggests uncertainty about the position of that star. Theta Crateris lies across the path of Barbarossa; it already has unusually strong "interstellar" absorption lines, and Barbarossa's dimming of USNO-B catalog stars mainly occurs retrograde to Barbarossa's position. So, Theta Crateris might have been much dimmed, and confused with other stars.
My best estimate of Barbarossa's heliocentric position (really, barycentric including only the other planets with the Sun, which here is practically the same thing as heliocentric) 143.91 yr past Dec. 21, 2012 AD (which also should correspond to Barbarossa's position on the Vulture Stone, if I guessed correctly about the date, and if there is no precession or other disturbance of Barbarossa's orbit) is, in J2000.0 celestial coords, RA 184.396 Decl -15.794, distance 254.8 AU. Including the correction for Earth parallax at this presumed date of the Vulture Stone, Barbarossa should theoretically have been seen 1.973deg away from Gamma Corvi, at "ecliptic position angle" (i.e., azimuth counting clockwise from ecliptic north) 90 - 50.12 = 39.88deg. As I measure on the photo, Barbarossa actually is, with perspective correction, 0.67deg away, at ecliptic position angle 65deg. The circle around Barbarossa, on the Vulture Stone, suggests a nebula.
