What are the three methods of determining latitude?

The three methods of determining latitudes are:

Celestial navigation - is the use of a celestial body such as the sun, the moon or a star at sight to know your location.

Sextant - is an instrument for navigation the uses two visible objects. The angle between the horizon and a celestial body will determine your location.

Octant - this is also an instrument used for navigation for calculation of angles.