Which of the following statement is incorrect about Local Celestial Meridian?

Vertical circle from North through Nadir to South point is called the Upper Meridian

LCM is used to measure local time in the Azimuth Elevation system

Vertical circle from North through Zenith to South point is called the Upper Meridian

Local Celestial Meridian (LCM) is the vertical circle passing through North point of the horizon, Zenith & the South point of the horizon

Correct Answer : Vertical circle from North through Nadir to South point is called the Upper Meridian

Explanation : Local Celestial Meridian (LCM) is the vertical circle passing through North point of the horizon, Zenith & the South point of the horizon. It is used to measure the local time. The vertical circle from North through Zenith to South point is called the Upper Meridian and the vertical circle from North through Nadir to South point is called the Lower Meridian.

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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.