They're golden angles! https://link.springer.com/content/pdf/10.1007%2Fs00004-015-0285-1.pdf https://link.springer.com/content/pdf/10.1007%2Fs00004-015-0... We

They're golden angles! https://link.springer.com/content/pdf/10.1007%2Fs00004-015-0285-1.pdf https://link.springer.com/content/pdf/10.1007%2Fs00004-015-0... Well the last one is. The significance of the other two angles, in OPs diagram, is unclear to me.