Here's why:

* Decans of Leo: Leo spans from July 23rd to August 22nd. It's divided into three decans:

* First Decan: July 23rd - August 2nd

* Second Decan: August 3rd - August 12th

* Third Decan: August 13th - August 22nd

Since August 14th falls within the dates of the third decan, that's where it belongs.