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Let an observer $A$ be situated on Earth's equator.
Let $A$ be facing the direction of Earth's rotation in space about its axis.
Then the North Pole is the particular one of Earth's poles which is on the left of $A$.
- 1976: W.M. Smart: Textbook on Spherical Astronomy (6th ed.) ... (previous) ... (next): Chapter $\text I$. Spherical Trigonometry: $4$. Terrestrial latitude and longitude.