Which of the following statements are true about Altitude?

It is measured in hours

It is analogous to longitude

Above the horizon is considered as negative sign

It is the angular distance of a point from the horizon

Correct Answer : It is the angular distance of a point from the horizon

Explanation : Altitude is the angular distance of a point from the horizon in vertical direction. So it is analogous to latitude system of the Earth & it is measured in degrees. Above the horizon is considered as positive sign whereas below the horizon is considered as negative sign.

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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.