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Which of the following can be used to estimate the latitude in the northern hemisphere using the horizon as a reference?

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Which of the following can be used to estimate the latitude in the northern hemisphere using the horizon as a reference?

(a) North pole

(b) Magnetic north

(c) Polaris

(d) Orion’s belt

The question was posed to me during an online exam.

This intriguing question originated from Stellar Inertial Navigation Theory in division Celestial Navigation, Doppler and Altimeter Radars of Avionics

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The correct answer is (c) Polaris

To explain: The north star or Polaris can be used to estimate latitude in the northern hemisphere using the horizon as a local level reference at the observers position. This type of navigation was used by the ancient mariners.

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