From the given options, which is the incorrect representation of the Azimuth?

0� = North point

90� = East point

180� = West point

270� = West point

Correct Answer : 180� = West point

Explanation : The North point of the horizon is considered 0° Azimuth. From that point, we measure distance eastwards. So that 90° Azimuth is the East point of the horizon whereas 180° & 270° represents the South point & the West point respectively.

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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.