One lunation 29.530588 mean solar days.
"A Text-Book of Astronomy"
George C. Comstock
The word lunation means the average interval from one new moon to the next one-i.
"A Text-Book of Astronomy"
George C. Comstock
No where in ancient America, was found the sabatical week of days, based on the 7 planets and the 4 quarters of a lunation.
"The American Nations, Vol. I."
C. S. Rafinesque