Lunation n. The period of a synodic revolution of the moon, or the time from one new moon to the next; varying in length, at different times, from about 29¼ to 29 5/6 days, the average length being 29 d., 12h., 44m., 2.9s.
... the mourners are free from tribute during a whole year. Any one who happens to enter a house, in which a grown up person lies dead, must not enter the house of Mangu-khan during a whole year; if the dead person is a child, he is only debarred for one lunation. One house is always left near the grave of the deceased; but the burial place of any of the princes of the race of Jenghis-khan is always kept secret; yet there is always a family left in charge of the sepulchres of their nobles, though I do not find that they deposit any ... — A General History and Collection of Voyages and Travels, Vol. 1 • Robert Kerr
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