The Pythagoreans had a morning habit. First thing each day, they would look up at the sky. This reminded them of the stars and planets, which always do their work without fail. It also reminded them of order, purity, and simple honesty. No star hides behind a cover.
The Pythagoreans were wont betimes in the morning the first thing they did, to look up unto the heavens, to put themselves in mind of them who constantly and invariably did perform their task: as also to put themselves in mind of orderliness, or good order, and of purity, and of naked simplicity. For no star or planet hath any cover before it.