南北極差,又曰南北里差,南北極高度也。
古人言:「天圓地方。天固圓矣,地果方乎?」
曰:「言其德耳,非形之果方也。萬象皆出於圓,況地凝天中,焉得不與之應。大戴禮曾子問言之矣。今觀北極出地度數,南北直行,輒二百餘里而高下差一度。如順天府地平測北極高四十度,南至雲南測北極高二十餘度,愈南則極高,度數愈少。至海外則北極下至地平。云自順天府北行至邊外,測北極高六十餘度。愈北則極高,度數愈多,逾北海則北極當上至天頂。可知地較天形不啻太虛之點塵,而靜處至中,輪廓周應亦同一渾然之體,此於北極高下而驗南北緯度之差者也。」
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