Dr. A. writes:
Indeed, what would it even mean to say that people "used" Stonehenge to observe lunar eclipses? You don't need a big bunch of megaliths to do so, you need a clear sky and a lunar eclipse. People used their eyes to observe lunar eclipses.
Maybe he meant observe as in "We observed a 2 minute silence."
quote:
Observe: To keep or celebrate (a holiday, for example): observe an anniversary.
But this lack of clarity does not bode well for a scientific book.