We can imagine that having a systematic part " v jk " that is a function of the characteristics of an object and person " j ", plus a random part " e jk ", which represents tastes, observational errors and a bunch of other things ( it gets murky here ) . ( An object such as a vehicle does not have utility, it is characteristics of a vehicle that have utility . ) The introduction of " e " lets us do some aggregation.
22.
Since the apparent motion was evidently caused neither by parallax nor observational errors, Bradley first hypothesized that it could be due to oscillations in the orientation of the Earth's axis relative to the celestial sphere a phenomenon known as nutation . 35 Camelopardalis was seen to possess an apparent motion which could be consistent with nutation, but since its declination varied only one half as much as that of ? Draconis, it was obvious that nutation did not supply the answer ( however, Bradley later went on to discover that the Earth does indeed nutate ).
