Earth and the Environment

How is a 'true altitude' determined in astronomy?

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The reading of the apparent altitude, as determined by a telescope attached to a graduated circle, must be corrected for refraction by the atmosphere and for certain other effects to ascertain the true altitude.

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Similar questions: What is the difference between an 'apparent altitude' and a 'true altitude' in astronomy? What is the process for determining a 'true' astronomical altitude? [ Hide these questions ]

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