Surveying
According to Napier's Rules of circular parts for a right angled triangle, sine of middle part equals the product of

Cosines of two adjacent parts
Tangents of two adjacent parts
Sines of two adjacent parts
Both (A) and (B) above

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Surveying
Circumpolar stars

Are seldom seen near the pole star
Rotate round the celestial pole
Remain always above the horizon
Rotate round the North Pole

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