Dweezil Zappa Dweezil Zappa Dweezil Zappa (born Ian Donald Calvin Euclid Zappa, September 5, 1969) is an American rock guitarist and occasional actor. He is the son of musical composer and performer Frank Zappa. Exposed to the music industry from an early age, Dweezil developed a strong affinity for playing the guitar and producing music. Able to learn directly from guitarists such as Steve Vai and Eddie Van Halen, Dweezil released his first single (produced by Eddie Van Halen) at the age of 12. In addition to writing and recording his own music, Dweezil has carried on the legacy of his father's
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