I wish to understand more about Asian chritianity,do christian consider these as superstitious stuff?...?

No....n fact, all Christians consider them not proper for them to do.....chosing a day, e.g. for wedding, is done for a day when most friends are free , e.g. weekends, so that they can attend the ceremony...and on a day when by experience, is most probably a fine day.....they prayers are offered for things to run smoothly....there are no consultations with books to find a "good" day.....any day is a good day if is convenient for things to get done....