the _dies caniculares_ (days of the dog). Precession has since put an end to the coincidence, but we still use the Greek phrase. The bank robbery that inspired the Al Pacino movie, _Dog Day Afternoon_ (1975), took place on August 22, 1972.

The opposite of a heliacal rise is an acronical one, that is, the star rises—not just before sunrise but also just after sun _set_ (on the opposite side of the sky). It can set just before sunrise, too, for that matter; that is "acronical setting." Notice, though, that acronical events are not as easily defined as are heliacal ones: Exactly when is "just before" sunrise and "just after" sunset? Collectively, heliacal and acronical risings and settings are called stellar phases.

### **AN EXAMPLE FROM NORTH AMERICA**

Just as theHarbor and later on the _USS Indianapolis_ in World War II. Or how the just-past full moon illuminated American Revolutionary Paul Revere's legendary late-night ride. (On the other hand, a dim moon did not illuminate the goings-on at the Boston Tea Party.) Olson has further used moon phases to date and time famous artwork, such as Ansel Adams's photograph, _Moon at Half Dome._

Our lunation continues. Now at sunset, the moon has not yet risen. For a time, there is no moon in the sky. When the moon does rise, it is in the gibbous phase again. The geometries that created the phases during the first half of the month now repeat, in reverse order, during the second half of the month. On successive nights, the gibbous moon grows