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Locating Celestial Objects: Understanding Altitude and Azimuth in the Night Sky

Discover how to find celestial objects in the night sky using altitude and azimuth. Altitude measures the angle of elevation from the horizon, with 0° at the horizon and 90° at the zenith above. Azimuth determines the angle from true North, measured clockwise; North is 0°, East is 90°, South is 180°, and West is 270°. Learn the use of quadrants and compasses for accurate measurements, and understand the adjustments needed for magnetic declination. Equip yourself with essential knowledge for stargazing and astronomy.

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Locating Celestial Objects: Understanding Altitude and Azimuth in the Night Sky

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  1. Where is it in the Night Sky?

  2. Altitude and Azimuth are simple ways to locate an object in the sky.

  3. Altitude Altitude(Alt.) is the angle of Elevation in degrees to the object from the Horizon. The Horizon is at 0° Alt. Straightupis the… Zenithat 90° Alt. Straight Down isthe… Nadir at – 90°Alt

  4. Azimuth Azimuth(Az) is the angle from North measured clockwise in degrees. North = 0° Az. East = 90 ° Az. South = 180 ° Az West = 270° Az

  5. Quadrants and Compasses A Quadrantis a simple instrument for measuring altitude. You will make and use one. A Sextantis a complex instrument that measures altitude very accurately.

  6. Compasses A Compassshows the direction of Magnetic North. This is 13° East of True North (called the angle of deflection), so when finding Azimuth you need to take that into account. Either… • Add 13° - OR - • Set the dial so that North is 13° west of the direction the needle points.

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