Which is the incorrect statement regarding the Ecliptic latitude?

It lies between �90�

It is taken as positive towards the Celestial North Pole

It is the angular distance of the object from the ecliptic plane

It is taken as positive towards the Celestial South Pole

Correct Answer : It is taken as positive towards the Celestial South Pole

Explanation : The Ecliptic latitude is the angular distance of the object from the ecliptic plane. It is taken as positive towards the Celestial North Pole. The ecliptic plane is referred to as 0° ecliptic latitude. The value increases to up to 90° on both up and down side.

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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.