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
Catalogue details

Licence: Public Domain Mark

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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    Thcfe 4 Points are in the Horizon which divide it into 4 equal Parts. Note, For the Ufes of Navigation, or Sailing, each of thefe Quarters of the Hea¬ vens, Eaft, JVeJi, North and South are fub- divided into eight Points, which are called Rhumbs 5 fo that there are 3 2 Rhumbs or Points in the whole, each containing nj Degrees. Thefe are aefcribed on the tu¬ rn oft Circle of the Wooden Horizon. From the North towards the Eaft thefe Points are named North and by Eaft, North North-Eafl, North - Eaft and by North, North-East 5 North-Eaft and by Eaft, Eaft~North-Eaft, Eaft and by North, East, &c. Then from the Eaft toward the South it proceeds much in the fame manner. The whole Circle of 360 Degrees divi¬ ded in this manner is called the Mariner s Compafs, by which they count from what Point of the Heavens the Wind blows, and toward what Point of the Earth they dired their Sailing, which they call Steering their Courfe. See Figure 2. IX, and X, are the two Solfticial Points: Thefe are the beginning of the Signs Cancer and Capricorn in the Ecliptick Line, where the Ecliptick juft touches thofe two Tropics. Thefe Points fhew the Sun’s Place the long- eft and fhorteft Days, (viz.) the 11th of June and the 11th of ‘December* 1 Note,