The Art of War by active 6th century B.C. Sunzi

4. The proper season is when the weather is very dry; the special days

are those when the moon is in the constellations of the Sieve, the Wall, the Wing or the Cross-bar; [These are, respectively, the 7th, 14th, 27th, and 28th of the Twenty-eight Stellar Mansions, corresponding roughly to Sagittarius, Pegasus, Crater and Corvus.] for these four are all days of rising wind.