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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.
The altitude angle (sometimes referred to as the solar elevation angle) describes how high the sun appears in the sky. The angle is measured between an imaginary line between the observer and the sun and the horizontal plane the observer is standing on.The altitude angle is negative when the sun drops below the horizon.(In this graphic, replace N with S for observers in the Southern Hemisphere.).he angle is measured between an imaginary line between the observer and the sun and the horizontal plane the observer is standing on. The altitude angle is negative when the sun drops below the horizon. (In this graphic, replace N with S for observers in the Southern Hemisphere.).