The Use of Lunar Observations for Navigation and Timekeeping

The phase of the moon is not a reliable method for navigation because it changes too quickly.

Altitude is the angle between a celestial object and the horizon.

Moonrise is the time when the moon first appears above the horizon, and moonset is the time when it disappears below the horizon.

Angular distance is the angle between two objects as seen from a third point.

The phase of the moon is the shape of the moon as seen from Earth.

The angle between the moon and the horizon can be used to determine latitude because it changes with the observer's latitude.

The time of moonrise or moonset can be used to determine longitude because it changes with the observer's longitude.

The time of moonrise or moonset can be used to determine the time because it is a predictable event.

Lunar timekeeping is the use of lunar observations to determine the time.

Lunar navigation is the use of lunar observations to determine latitude.

Lunar navigation is the use of lunar observations to determine longitude.

Lunar timekeeping is the use of lunar observations to determine the time and date.

Lunar navigation is the use of lunar observations to determine the position of a ship at sea.

Lunar astronomy is the use of lunar observations to determine the position of a celestial object.

Lunar parallax is the use of lunar observations to determine the distance to a celestial object.