I know that the religious holidays for the entire world all differ. But for the Secular holidays is the only one celebrated by everyone the New Years eve day/New Years day? How about the Secular holidays like mothers day , fathers day ? ( They are really important to a lot of US families including mine what about the other world for those days do they celebrate them or equivalent i.e does all civilizations for the most part celebrate some form of a mothers day / fathers day) I can see the only real universal one that I am pretty sure of is the new years one since that is based on natural occurrence in nature that applies for every one. Don't know if there is any other nature occurrences in nature that we deem as holiday's or special days since that would answer my question a list of all of these but then if you go to far you could classify anything in nature as a holiday (of course then again all people don't have to celebrate it so I guess I am just going in circles) I understand obviously other secular holidays are more restricted to the nation or region of the world. Not so much the entire world. Other last questions is Easter always falls on the first Sunday after the first full moon on or after the vernal equinox (does this mean it will always be in march, may or April... going by my math it would) And curious what holidays your families celebrate please post the ones that matter to your families.