There is considerable literature on this question, and closely related variations. See:
- The Thompson problem.
- The Tammes problem.
![DiskPacking][1]
(Image from [Paul Sutcliffe](http://www.maths.dur.ac.uk/~dma0pms/my-projects/proj4_1213.html).)
![DiskPacking][1]
(Image from [Paul Sutcliffe](http://www.maths.dur.ac.uk/~dma0pms/my-projects/proj4_1213.html).)
Joseph O'Rourke
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