Pamela Des Barres nanny for Zappa's children, Dweezil and Moon Unit. On October 29, 1977, she married Michael Des Barres who had been lead singer for Detective (signed to Led Zeppelin's Swan Song Records label) and Silverhead, and who, in 1985, was tour vocalist for Power Station. They have a son, Nicholas Dean Des Barres ("GameFan" magazine's Nick Rox). The couple divorced in the summer of 1991. Des Barres wrote two memoirs about her experience as a groupie, "I'm with the Band" (1987) and "Take Another Little Piece of My Heart: A Groupie Grows Up" (1993). Conjecture has been published saying that Cameron
Digit (unit) one twelfth of the diameter of the sun or the moon. This is found in the Moralia of Plutarch, XII:23, but the definition as exactly one twelfth of the diameter may be due to Ptolemy. Sosigenes of Alexandria had observed in the 1st century AD that on a dioptra, a disc with a diameter of 11 or 12 digits (of length) was needed to cover the moon. The unit was used in Arab or Islamic astronomical works such as those of Ṣadr al‐Sharīʿa al‐Thānī (d.1346/7), where it is called "iṣba' ", digit or finger. The astronomical digit was in use