Notes on the orientation of the town-planning of Nicopolis, the capital of Old Epirus

Here we will consider the town-planning of Nicopolis, that is the City of the Victory, founded by Augustus and capital of the Old Epirus. We will consider in particular the orientation of its main street, the decumanus. The varatio, that is the geometry based on right triangles used to determine the orientation of the town-planning, has a ratio of 1:3. No astronomical orientation seems to be evident for the town. It exists just a faint link to the beginning of the spring at Roman time, that is to the sunrise on 7 February