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An equation, generally used for solar energy applications, can be applied toarchaeoastronomical calculations to determine the day of foundation of ancienttowns. The equation is that giving the sunrise amplitude, and, the direction ofthe sunrise on the day of foundation was sometimes used to determine the mainstreet of the town. Here we discuss the case of Timgad, a town founded by theRoman emperor Trajan. Probably, Timgad was founded during the first decade ofSeptember.

The orientation of Trajan's town of Timgad