Surveying
A star in northern sphere is said to transit

When it is in south
When its altitude is maximum
When its azimuth is 180°
All listed here

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Surveying
The meridian of a place is

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

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