Abstract
A MAIN difficulty of accurate time determination is the personal equation of the observer. Although the term ‘personal equation’ suggests that any trained observer would have a fixed personality, such is not found to be the case; and two observers will differ by different amounts in varying circumstances.
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HUNTER, J. A New Principle of Time Observation, especially for Determination of Longitude. Nature 130, 666 (1932). https://doi.org/10.1038/130666a0
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DOI: https://doi.org/10.1038/130666a0


