Ecliptic Coordinate system is also known as _____

Heliocentric system

ECI system

Selenocentric system

Azimuth Elevation system

Correct Answer : Heliocentric system

Explanation : The Ecliptic Coordinate system is also known as the heliocentric system as it takes the Sun as the reference. The ECI and the Azimuth Elevation system take the Celestial Equator and the Celestial Horizon as the reference, respectively. The Selenocentric Coordinate system is based on Moon as the reference.

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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.