12/41 They obtain the time for the college by meridian passage of stars; they use the equatorial just as far as they can do with very insufficient mechanism. We work wholly on planets, and they are taught to find a planet at any hour of the day, to make drawings of what they see, and to determine positions of planets and satellites. With the clock and chronograph they determine difference of right ascension of objects by the electric mode of recording. They make, sometimes, very accurate drawings, and they learn to know the satellites of Saturn (Titan, Rhea, etc.) by their different physiognomy, as they would persons. They have sometimes measured diameters. |