The knowledge of the heavens and the earth made easy: or, the first principles of astronomy and geography. Explain'd by the use of globes and maps with a solution of the common problems by a plain scale and compasses as well as by the globe / Written several years since for the use of learners.

Watts, Isaac, 1674-1748.

Date:: 1728

Credit: The knowledge of the heavens and the earth made easy: or, the first principles of astronomy and geography. Explain'd by the use of globes and maps with a solution of the common problems by a plain scale and compasses as well as by the globe / Written several years since for the use of learners. Source: Wellcome Collection.

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$Degree of that Sign he is every Day in the Year, whether you count by the Old Style or the New. Note, One Side or Edge of brazen Me¬ ridian is alfo divided into 360 Degrees or 4 times 90 5 on the upper Semicircle where¬ of the Numbers ufually begin to be count¬ ed from the Equator both ways toward the Poles: On the under Semicircle they begin to be counted from the Poles both ways toward the Equator for fpecial Ufes, as will afterward appear. And it fhould be remem- bred that ’tis this Edge of the Brafs Circle, which is graduated or divided into Degrees, that is properly the Meridian Line. Note, The Equator and the Ecliptick are called Unchangeable Circles, becaufe where- fover we Travel or Change our Place on the Earth thefe Circles are ftill the fame, SECT, III. Of the Lejfer Circles. TH E Lejfer Circles divide the Globe into two unequal Parts, and are thefe four, all parallel to the Equator, (viz.) the two Tropics and the two Tolar Circles. I. The Tropic of Cancer juft touches the North Part of the Ecliptick, and deferibes the Sun's Path for the longeft Day in Sum¬ mer: Tis drawn at 23^ Degrees diftance from the Equator toward the North, And \is$