In the Hour Angle System, the position of the celestial body is based on the location of the observer. The position of the star is defined by the local hour angle of the star and its declination or polar distance.

In the Hour Angle System, the position of the celestial body is based on the location of the observer. The position of the star is defined by the local hour angle of the star and its declination or polar distance.

• A. Greenwich hour angle
• B. sidereal hour angle
• C. Hour Angle System
• D. Local hour angle

Answer: (C)

In the Hour Angle System, the sky is described from the observer’s viewpoint, using the local hour angle of the body together with its declination. The local hour angle measures how far west the object is from the observer’s local meridian and changes with time as the Earth rotates. Declination provides the north–south position relative to the celestial equator. Together, these two coordinates locate the star in the sky for that specific observer and moment. Other references like Greenwich hour angle or sidereal hour angle describe different reference points or measurements and don’t define the observer-centered coordinate framework that combines local hour angle with declination.

In the Hour Angle System, the sky is described from the observer’s viewpoint, using the local hour angle of the body together with its declination. The local hour angle measures how far west the object is from the observer’s local meridian and changes with time as the Earth rotates. Declination provides the north–south position relative to the celestial equator. Together, these two coordinates locate the star in the sky for that specific observer and moment. Other references like Greenwich hour angle or sidereal hour angle describe different reference points or measurements and don’t define the observer-centered coordinate framework that combines local hour angle with declination.