Surveyors in the Northern hemisphere have a great advantage in determining the
astronomical azimuth of a line, especially between latitude 15° and 60° due to Polaris.
Polaris is the star that helps anyone find his orientation towards the north. It makes a
small circle, about 1° radius, around the North Astronomical Pole and its apparent
motion is very slow. It is a bright star with a magnitude of 2.1, which makes it visible
at night and easily recognised, as it is the last star at the tail of the Ursa Minoris (Little
Bear) constellation. Besides that, the star constellations of Ursa Majoris (Great Bear)
and Cassiopeia help to find this valuable star in the celestial sphere.