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Our latitude in Shawnee is 35 degrees north, and we find Polaris 35 degrees above the northern horizon. Similarly, to sail west at a constant latitude Columbus kept the north star at a constant altitude above the horizon.
At winter solstice (21 December), the sun's rays make an angle of -23Â° 27' to the equatorial plane. The beam radiation is approximately perpendicular to the Tropic of Capricorn (20Â°30'S). In the northern hemisphere, the days are at there shortest and the solar altitude at noon has its lowest values.he horizon is represented by the outermost circle, at the periphery. The altitude of the sun above the horizon is read on the various concentric circles, from 0 to 90 degrees. The angle of azimuth is written on the periphery (0 degrees is south, east and west are 90 degrees on either side).