The 5th note from G is D, which has two sharps: F and C. The key of C has no sharps or flats, but the key of G has one: F sharp. For example, the 5th note from middle C on the piano is G. In the common scales used in western music, the "circle of 5ths" shows a natural progression of sharps and flats. Kepler's use of quintiles as 360/5 stems from the ancient Mesopotamian sexagesimal (base 60) arithmetic system, from which we get our main compass bearings measurement of angles, time-keeping in hours, minutes, and seconds and the earth's graticule of latitude and longitude. The heath family flowers have 5 petals- about 4000 species there. A lot of other plant families have a 5-fold pattern- like cannabis. Not just roses, but stone fruits like cherries and plums, apples, pears, trees like hawthorns and mountain ash, almonds, and cane fruits like blackberries. The Rosaceae plant family has nearly 5000 species: characterized by 5-petaled flowers and a symmetrical 5-fold pattern of seeds. I might mention that the number 5 is very common in nature, especially in the plant kingdom.
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