The membership is on an annual base and goes from September of the current year to September of the following year. This mean that if you become a member in February for istance, your membership will last until the next September, not until the next February.
This is done to align our Business Year to the one of EUROAVIA and to the University Academic Year. Every year indeed, we have to communicate the number of AS Forlì-Bologna members to EUROAVIA and pay the fee accordingly.