Rotational work is common for the field operator, often involving eight days of 10-hour shifts followed by six days off. Unlike plant operators, field operators usually work days. Evening call-outs can occur if maintenance or production issues arise at a well site the operator covers.
Before the advent of telescopic photography, eight moons of Saturn were discovered by direct observation using optical telescopes. Saturn's largest moon, Titan, was discovered in 1655 by Christiaan Huygens using a 57-millimeter (2.2 in) objective lens on a refracting telescope of his own design. Tethys, Dione, Rhea and Iapetus (the  Sidera Lodoicea ) were discovered between 1671 and 1684 by Giovanni Domenico Cassini.
Both first ones (Titania and Oberon) were discovered by William Herschel in 1787. Two other moons, Ariel and Umbriel, were discovered by William Lassell in 1851. It is John Herschel, the son of William who gave their names to the first four moons of Uranus (Oberon, Titania, Ariel, Umbriel).Names are pulled by the characters of the  Dream of a summer night  of William Shakespeare.Gerard Kuiper discovered Miranda in 1948.oth first ones (Titania and Oberon) were discovered by William Herschel in 1787. Two other moons, Ariel and Umbriel, were discovered by William Lassell in 1851. It is John Herschel, the son of William who gave their names to the first four moons of Uranus (Oberon, Titania, Ariel, Umbriel).