History... Romans... Pompei

"The Romans divided the day into twelve hours.  The first, hora prima, began at sunrise. The last, hora duodecima, ended at sunset. 

The night was divided into eight watches:

- Vespera, Prima fax, Concubia, and Intepesta before midnight; 

- Inclinatio, Gallicinium, Conticinium, and Diluculum after it. 

The days of the week were: Moon, Mars, Mercury, Jupiter, Venus, Saturn, and Sun. 

Sunrise on the Bay of Naples in the fourth week of August A.D. 79 was at approximately 06:20 hours.

(a note from "Pompeii" by Robert Harris)