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Correct Answer : It is constant for a fixed object
Explanation : The Ecliptic longitude is defined as the angular distance of the object along the ecliptic plane. It is measured eastward from Vernal equinox and it ranges from 0° to 360°. Because of precession, the value for a fixed object changes by 50.3 arc-seconds per year.
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.
Correct Answer : Option (A) : Orthogonal matrix
Correct Answer : Option (B) : (-x, y)
Explanation : When a point has to be reflected across the y-axis, the y value stays the same and the x value becomes opposite of what it is.
