Which of the following is not a parameter of the Ecliptic system?

Azimuth

Distance

Ecliptic latitude

Ecliptic longitude

Correct Answer : Azimuth

Explanation : The Ecliptic system uses 3 parameters to locate a celestial object in the celestial sphere. The three parameters are Ecliptic longitude, Ecliptic latitude and Distance. Azimuth is a parameter used in the Azimuth Elevation system.

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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.