The Prime Vertical passes through which three points on the celestial sphere?

A)
East point of the horizon, Zenith & the South point of the horizon
B)
North point of the horizon, Zenith & the West point of the horizon
C)
North point of the horizon, Zenith & the South point of the horizon
D)
East point of the horizon, Zenith & the West point of the horizon

Correct Answer :   East point of the horizon, Zenith & the West point of the horizon


Explanation : The Prime Vertical passes through the East point of the horizon, Zenith & the West point of the horizon. The vertical circle needs two opposite points on the horizon to connect; otherwise, it will become triangular in shape instead of a half-circle. So the vertical circle cannot pass through East South & North West pair of points. The vertical circle passing through North point of the horizon, Zenith & the South point of the horizon is known as Local Celestial Meridian (LCM).