Surveying
A star is said to elongate

When the star momentarily moves vertically
When the star
All of these
When the angle at the star of the spherical triangle is 90°

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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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