yes
A "meridian"
If you see the North Star go below the horizon, assuming you have identified it correctly, then you would have to be moving south across the equator.
The altitude of the celestial north pole above the northern horizon is exactlythe observer's north latitude on the earth. The center of Frankfurt is very closeto 50° North latitude.
It depends exactly where you are on Earth. If you are on the Equator, the elevation is 0 degrees. If you are at the North Pole, 90 degrees. Anywhere else in the Northern Hemisphere will fall somewhere in between. If you subtract your latitude from 90 degrees, that will tell you the altitude of the North Star.
At the equator, the celestial north pole would be north, just at the horizon. In the southern hemisphere, for instance in Australia, the north celestial pole would be north, and as many degrees BELOW the horizon as your latitude. For instance, if you are 10 degrees south of the equator, the celestial north pole would be 10 degrees below the equator.On the other hand, for people in the southern hemisphere, the celestial SOUTH pole would be ABOVE the horizon; this same pole is below the horizon for anybody in the northern hemisphere.
If you are right at the Equator, you will not be able to see Polaris. If you could, it would be right on the horizon, but ground haze and obstructions would almost certainly hide it from view.
The horizon facing north
The North star will be 75 degrees above the horizon. Whatever degree you are at latitude, the North star will be the same degrees up. So at the north pole (90 degrees north), the star will be at the zenith (straight up). While at the equator (0 degrees north) the star will be at the horizon.
The angle between the north star and the horizon is roughly your position in degrees latitude.For example, look at the North Star and point one arm straight at it, and then hold your other arm level with the horizon. The angle between your arms is roughly the degrees of latitude of your location.
The answer depends on which angle is 39 degrees.
Establish true North and grid North.
The Earthg's north pole points very close to Polaris in the sky. So Polaris is directly over your head when you stand at the north pole, it's on your horizon when you stand on the equator, and it's somewhere between your horizon and the point directly over your head when you stand somewhere between the north pole and the equator.
The angle of Polaris above the northern horizon is very nearly equal to your north latitude, within about 1/3 of a degree. So it's over your head when you stand at the north pole, it sits nominally on your north horizon when you stand anywhere on the equator, and if you're south of the equator, you can never see it at all.
I believe it dates back to when the North Star was used to find latitude by ancient sailors. Degrees latitude was found by the angle between the North Star and the horizon. Since the North Star sits on the horizon at the equator the angle is zero therefore latitude is zero degrees.
The cast of North Horizon - 2010 includes: Thomas Freundlich as Dancer Valtteri Raekallio as Dancer
Zero. (It's on the horizon.)
A sextant measures the angle of elevation between the horizon and the north star. Along with charts, it can be used to calculate your position on the sea fairly accurately.