Dobson: Some historians claim that the people who built a ring of stones thousands of years ago in Britain were knowledgeable about celestial events. The ground for this claim is that two of the stones determine a line pointing directly to the position of the sun at sunrise at the spring equinox. There are many stones in the ring, however
the chance that one pair will point in a celestially significant direction is large. Ttherefore, the people who built the ring were not knowledgeable about celestial events .
Dobson's conclusion logically contradicts some of the evidence presented in support of it.