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What is azimuth, altitude and declination in astronomy?

Answer 1

Christopher Ales

Azimuth is the angle measured from north through East in degrees.

Altitude is the elevation of an object from the horizon.
declination is the equivalent of Latitude in celestial sphere.

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Answer 2

Luke Allen

Azimuth refers to the horizontal direction of a celestial object, measured clockwise from the north direction. Altitude is the angular distance of a celestial object above the observer's horizon. Declination is the angular distance of a celestial object north or south of the celestial equator, measured along the object's hour circle.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.