This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1838 Excerpt: ... that is, between the vernal and autumnal equinoxes there are eight days more than between the autumnal and vernal. It is well known that the degree of heat is not greatest when the days are longest. We have the warmest weather in the latter part of July, and in the first of August; and our coldest month is January. To ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1838 Excerpt: ... that is, between the vernal and autumnal equinoxes there are eight days more than between the autumnal and vernal. It is well known that the degree of heat is not greatest when the days are longest. We have the warmest weather in the latter part of July, and in the first of August; and our coldest month is January. To account for this it has been stated, that a body once heated does not grow cold again instantaneously, but gradually; now as long as more heat comes from the sun in the day than is lost in the night, the heat of the earth and the air will be daily increasing, and this must evidently be the case for some weeks after the longest day, both on account of the number of rays which fall on a given space, and also from the perpendicular direction of those rays. It is for the same reason, that the warmest part of the day is not, when the sun is at the meridian, but about two or three o'clock in the afternoon., SUCCESSION OF DAY AND NIGHT. LESSON XXX. By the daily motion of the earth on its axis, the same phenomena appear as if all the celestial bodies turned round it; so that in its rotation from west to east, when the sun or a star just appears above the horizon, it is said to be rising, and as the earth continues its revolution, it seems gradually to ascend till it has reached its 19. How is this less degree of heat in northern latitudes compensated? 20. Why does the earth move faster in one part of its orbit than in another part'21. How much longer are the summers in northern than in southern latitudes? 23. At what times in the year is our degree of heat the greatest? And greatest degree of cold? 23. Why is this? 23. Why is it warmer about two o'clock in the afternoon than when the sun is at meridian height? 1. What phenomena are exhibited from the...
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