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.
A collage of Saturn (bottom left) and some of its moons: Titan, Enceladus, Dione, Rhea and Helene. Credit: NASA/JPL/Space Science Institute. Saturnâs moons have such a variety of environments between them that youâd be forgiven for wanting to spend an entire mission just looking at its satellites. From the orangy, hazy Titan to the icy plumes emanating from Enceladus, studying Saturnâs system gives us plenty of things to think about. Not only that, the moon discoveries keep on coming. As of April 2014, there are 62 known satellites of Saturn (excluding its spectacular rings, of course).