Surveying
When a star is between the pole and the horizon, the relationship between latitude (λ), zenith distance (z) and declination δ, is

θ = z + δ
θ = δ - z
θ = 180° - (z + δ)
θ = (z + δ) - 180°

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Surveying
The First Point of Aeries

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

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