Note 43 — Chapter I

The ancients portioned out the globe by bands or zones parallel to the equator, which they named κλίματα. The extent of each zone was determined by the length of the solstitial day, and thus each diminished in extent according as it became more distant from the equator. The moderns have substituted a mode of reckoning the degrees by the elevation of the pole, which gives the latitudes with much greater accuracy.