Author： Hartog P.
Publisher： Maney Publishing
ISSN： 1752-2706
Source： Survey Review, Vol.17, Iss.130, 1963-10, pp. : 165-172
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Abstract
Thus far, it has been possible to regard all observations from latitudes of some 2° North or South as being made from the equator. For this determination, however, more precision is required.
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