Recently two archaeologists used computer software in order to simulate the sun’s positions in Alexandria during the time the city was built. They did this in order to determine whether the city was built to align with the sun on the birthday of Alexander the Great. For this they had to consider that the sun paths differ in the modern day to those observed in the past as well as the differences between the Julian calendar and ours.
The computer software they used allowed them to easily determine whether this assumption was true or not. It turns out that the city does in fact align with the sun on the birthday of Alexander the Great, which has now encouraged the team to analyse other cities built by Alexander the Great using the same software.
To read more on this check out the article here.