Editor: In which day of the week were you born? In which day of the week did the French Revolution start? Which day of the week will 2.2.2044 be? Feed Galileo any date, and you will get the weekday of such date. Moreover, what is the current Islamic year? or the current Bengali year? Or what were the Islamic and Bengali years in 1759? Galileo is able to provide you with this kind of answers too, and lets the user add/remove other Eras besides the default (Bengali and Islamic) ones. Eventually you may retrieve the dates of Easter Sundays, etc.