Symzonia: Voyage of Discovery

On the other hand, it does not recede so far as to withdraw its rays from the pole for a single hour during seven months of the year. This we know; and you can imagine, from the effect of a March sun, which in your country, Mr. Slim, loosens the icy fetters of winter, although withdrawn one half of the time, what must be its effect when exerting its influence for months without any interruption? Now in latitude 70°, with the exception of a few days, there is an interval of night the year round. In the winter months the climate cannot differ much from that of the pole. The cold is then no doubt severe, and forms ice in both those positions. In the early part of summer, that is, September, October, and November, there is at the pole a steady blaze of heat and light, which must melt the ice accumulated in winter, by causing a constant thaw. This sunshine continues at the pole till the 1st of April, and prevents the forming of ice until that time. But at 70°, there is, through most of these months, a short period of night, sufficient for the atmosphere to cool. This will be more obvious, if we consider the powerful influence of the ice, during this absence of the sun's rays, and remember the great change of temperature which occurs in our climate immediately after sunset at the close of a sunny day in February or March. This interval of night in latitude 70°, counteracts most of the effects of the sun's heat in the day time. Nearly as much ice forms in the night as is thawed during the day. This accounts for the 'icy hoop.' There is not summer enough to dissipate the ice of winter; while at the pole there is summer enough to dissolve a globe of ice."