例文
- A nautical almanac and a marine chronometer are used to compute the subpoint on earth a celestial body is over, and a sextant is used to measure the body's angular height above the horizon.
- X is described in terms of its angular height above or below the equator, known as its Declination ( corresponding to its Latitude ), and its'Hour angle', the angle between its meridian and that of X will be its Greenwich Hour Angle, measured in degrees.
