With an astrolabe Hipparchus was the first to be able to measure the geographical latitude and time by observing stars.

There are specimen from different geographical latitudes which makes it interesting for the scientists.

However they disturb the F-layer of the ionosphere, especially at middle and high geographical latitudes, causing a so-called ionospheric storm which degrades radio propagation.

If the time of observation is not 12:00 noon local mean time, then depending on one's geographical latitude, this loop will be inclined at different angles.

Astrolabes are calculation instruments that enable their users to tell the time and determine their geographical latitude using the position of the sun and stars.

That is, the style's horizontal angle must equal the sundial's geographical latitude.

Such shadow lengths will vary with the geographical latitude and with the time of year.

Depending on the geographical latitude and time of year, the light-spot follows a conic section, such as the hyperbolae of the pelikonon.

The geographical latitude of the settlement is North 44 45' 42.9", while the longitude is East 20 54' 20.72".

That same year, he began to design and construct his own astronomical instrument, and set out to determine the geographical latitude of the city of Dorpat.