urate calculus uric acid calculus. urethral calculus a urinary calculus in the urethra; symptoms vary according to the patient's sex and the site of lodgment. uric acid calculus a hard, yellow or reddish-yellow urinary calculus formed from uric acid.
In some traditions, the first day of Christmas begins on the evening of December 25th with the following day considered the First Day of Christmas (December 26th). In these traditions, the twelve days begin December 26 and include Epiphany on January 6. The origin and counting of the Twelve Days is complicated, and is related to differences in calendars, church traditions, and ways to observe this holy day in various cultures (see Christmas).
As of 2016, Christmas Day was last on a Monday in 2006. It will  next be on a Monday in 2017. An 11 year gap is common, caused by  days being skipped over by a leap year. Itâ¦ was on a Sunday in 2011,  but skipped Monday in 2012 and was on a Tuesday, as it was a leap  year. 3 people found this useful.