Can I leave on the fifteenth day of the first month?

It is not advisable to travel far on the fifteenth day of the first month.

Because the time to go out in the first month is particular, you usually go out on auspicious days such as the sixth and eighth day, but if it is the first, third, fourth, seventh and fifteenth day, don't go out.

You can't go out for seven or eight days on the first day of the first month. The so-called seven days means that you can't go out for business or work on the seventh day of the first month, otherwise you can't do business well and things can't be done. Eight no return means that people who leave home can't go home on the holiday day, because "return" means end and end. Here, "eight" is a metaphor for hair. If you want to "send", you can't end it.