Locating Objects in the Night Sky

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Presentation transcript:

Locating Objects in the Night Sky Where is it? Locating Objects in the Night Sky

The Celestial Dome The Celestial Dome is the sky as we see it with the naked eye. Until about 500 years ago, we assumed that the entire universe was contained in an “inverted bowl” that stretched from horizon to horizon, 180◦ around. We still use the term Celestial Dome as a convenient way to map the sky as we see it.

The Horizon The Horizon is the edge of the Celestial Dome, where the Dome meets the Earth, 180⁰ around (again!)

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

Altitude Altitude (Alt.) is the angle of Elevation in degrees to the object from the Horizon. The Horizon is at 0° Alt. Directly UP is the… Zenith at 90° Alt. Straight DOWN is the… Nadir at – 90°Alt .

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

Finding Azimuth A Compass shows the direction of the Magnetic North pole. An Azimuth Ring is a circular scale which rotates and is used to find the Azimuth of an object

A compass with a transit makes finding azimuth even easier

The Problem of the Two Norths True North is where the earth’s axis is. Magnetic North is not the same place Azimuth is measured from True North So we must correct for it Magnetic North is 13° East of True North in CA (called the angle of deflection), so when finding Azimuth you need to take that into account. Either… Add 13° Set the dial so that North is 13° west of the direction the needle points.