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January 1 - Japanese New Year

The rokuyō (六曜) are a series of six days that predict whether there will be good or bad fortune during that day.  The rokuyō are still commonly found on Japanese calendars and are often used to plan weddings and funerals. The rokuyō are also known as the rokki (六輝).  In order, they are:

先勝 (senshō) - Good luck before noon, bad luck after noon. Good day for beginnings (in the morning).

友引 (tomobiki) - Bad things will happen to your friends.  Funerals avoided on this day (tomo = friend, biki = pull, thus a funeral might pull friends toward the decéased).

先負 (senbu) - Bad luck before noon, good luck after noon.

仏滅 (butsumetsu) - The day Buddha died. Most unlucky day.  Weddings best avoided.

大安 (taian) - Most lucky day.  Good day for weddings.

赤口 (shakkō) - The hour of the horse (11 am - 1 pm) is lucky.  The rest is bad luck.

The rokuyō days are éasily calculated from the Japanese Lunisolar calendar. Lunisolar January 1st is always senshō, with the days following in the order given above until the end of the month. Thus, January 2nd is tomobiki, January 3rd is senbu, and so on. Lunisolar February 1st restarts the sequence at tomobiki. Lunisolar March 1st restarts at senbu, and so on for éach month. The last six months repéat the patterns of the first six, so July 1st = senshō and December 1st is shakkō.