Imatges de pàgina
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Perifcii.

The Perifcii inhabit within the polar Circles, and have their Shadows every Way, the Sun being above their Horizon all the 24 Hours, feveral Months in the Year, viz. when it is on the fame Side of the Equator they are of; and if there were any Inhabitants at either of the Poles, they would have but one Day of 6 Months, and one Night of the fame Length.

S. What are we to understand by Climates?

M. Climates are Spaces on the Surface of the Climates. Globe, bounded by imaginary Circles parallel to the Equator, fo broad that the Length of the Day in one exceeds that of another half an Hour, of which there are 60 in Number, viz. 24 from the Equator to each of the Polar Circles, and 6 from either of the Polar Circles to the respective Poles, between which laft, there is a Difference of an entire Month; the Sun appearing in the first one Month above the Horizon without fetting, in the fecond two Months, and fo on to the Pole, where there is a Day of 6 Months, and the Nights proportionable, when the Sun is on the oppofite Side of the Equator.

S. Are thefe Climates of an equa I Breadth ?

M. No, thofe near the Equator are much the broadeft; For Example, the firft Climate next the Equator is 8 Degrees odd Minutes in Breadth, whereas the 11th Climate is little more than 2 Degrees broad, as may be obferved in the following Table.

Climates.

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In the frigid Zone the Days encrease by Months.
A Day of one Month in 67

30

2 Months in 69

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3 Months in 73

20

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N. B. The End of one' Climate is the Beginning of the next. At the first Climate, which begins at the Equator, the Day is just 12 Hours long at the Beginning of the Climate, and 12 Hours 30 Minutes at the End of it, viz. in 8 Degrees 25 Minutes of Latitude, where the fecond Climate begins. VOL. I.

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S. I

S. I obferve that every Degree of Latitude contains 60 Geographical Miles, please to inform me how many fuch Miles are contained in a Degree of Longitude?

M. Every Degree of Longitude counted on the Equator is 60 Geographical Miles, but as the meridional Lines approach nearer each other as you advance towards either Pole, confequently the Number of Miles between thofe Lines muft leffen in Proportion; for instance, a Degree of Longitude in 52 Degrees of Latitude contains but 37 Miles, tho' it be full 60 Miles upon the Equator, and this will be found by measuring the Distances as well as by the following Table, which thews how many Miles are contained in a Degree of Longitude in every Latitude.

A TABLE of the Length of a Degree of Longitude in every Latitude.

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