What are instances of the number 7 in nature?

Nachmanides (12th century Spain) explains a beautiful kabbalistic concept: Seven is the number of the natural world. There are 7 days in the week, 7 notes on the musical scale and 7 directions (left, right, up, down, forward, back and center). “Seven” - represented by the 7 days of Sukkot, is the world of nature. read more

The number 7 is also a mystical and important number for the Theosophists, to the extent that aspects of the theology/philosophy are infused with it to a nonsensical degree: “ Theosophists have always taken Atlantis for granted, and to the myth have added a second one - the myth of Lemuria. read more