  Recently some stone structures covering the harraat of the Syrian desert had
been investigated using satellite imagery (arXiv:1106.4665). Dispersed in an
arid landscape, they were probably made during the Neolithic period. Some of
these structures are here discussed, which display a possible use as ancient
sun observatories. For the analysis, a freely available software is used which
can be quite suitable for evaluating the effect of solar radiation on physical
features of natural structures too.
