ONE:There was more than Larry had ever dreamed there would be to keep in mind: there was the maintaining of level flight; even in his simplest personal contact with the controls; then there was the job of keeping the horizon line at the right location by watching past a chosen spot on the engine cowling, else they would start to climb or go into a glide. There was the real horizon to distinguish from the false horizon, which an airman knows is, through some trick of the air, the visible horizon that is just a little bit above the true horizon, so that to hold level flight in a forward direction, that false horizon is not held on a line with the top of the engine cowling, but, to hold a line with the true horizon the marking point is held just a trifle below that false, visible horizon line.
