Surveying
The meridian of a place is

An arc of the great circle which passes through the place and is perpendicular to the equator
A great circle passing through the place and the poles
A great circle whose plane is perpendicular to the axis of rotation and it also passes through the place
A semi-circle which passes through the place and is terminated at the poles

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Surveying
The First Point of Aeries

Is usually denoted by the Greek letter ?
All listed here
Is the point in the celestial sphere where zero meridian crosses the celestial equator
Is located near the very conspicuous rectangle of stars in the constellations of Pegasus and Andromeda

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