Dip of the horizon
| (Astron.) | the angular depression of the seen or visible horizon below the true or natural horizon; the angle at the eye of an observer between a horizontal line and a tangent drawn from the eye to the surface of the ocean. | (Astron.) | the vertical angle between the sensible horizon and a line to the visible horizon, the latter always being below the former. |
See also: Dip, Horizon