babies born on October 10, supposedly conceived on New Year's Day; normal gestation time (i.e. 9 months)
210th day (from the first day of spring according to the lunar calendar); the storm day
Harvest festival held on the night of the tenth day of the tenth month (to send the rice paddy gods back to the mountains after harvest)
Tōka Ebisu; festival held on January 10 in honor of Ebisu, the god of fishing and commerce
something that comes too late and is useless; (lit.) chrysanthemum blooming on the 10th (i.e. one day too late for the Chrysanthemum Festival)