The Azimuth Elevation system uses which two parameters to identify the location of any celestial object?

Altitude, Azimuth

Azimuth, Declination

Altitude, Declination

Right ascension, Declination

Correct Answer : Altitude, Azimuth

Explanation : To identify the location of any celestial object, the Azimuth Elevation system uses two parameters, Altitude & Azimuth. In the Equatorial Coordinate system, the two parameters used are Right ascension & Declination.

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How many rotations are required to transform the ECI coordinate system to the perifocal system?

Correct Answer : Option (D) : 3

Explanation : The coordinate transformation from XYZ frame to X’Y’Z’ frame is carried out by a single rotation about one axis. The other two axes remain in the same plane. But to transform from the ECI coordinate system to the perifocal system, there have to be successive 3 rotations. The first rotation is about Z axis, second is through X’ axis and the final rotation is bout Z’’ axis.