Nadir & Celestial South Pole always coincide in the Azimuth Elevation system.

True

False

Can Not Say

None of the above

Correct Answer : False

Explanation : Nadir is the point opposite to the Zenith, on the celestial sphere. Zenith is defined as the point of sky overhead the observer, on the celestial sphere. As the celestial horizon depends on the position of the observer on the Earth, it can coincide with the Celestial North Pole & Celestial South Pole, but that is not always the case.

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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.