A New Treatise on the Use of the Globes, and Practical Astronomy; Or, a Comprehensive View of the System of the World

A New Treatise on the Use of the Globes, and Practical Astronomy; Or, a Comprehensive View of the System of the World

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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. 1812 edition. Excerpt: ...S (see the fig. in the note to prob. 31, part 3) be the point of the ecliptic which hcs with the star, and let O be the place of the sun in the ecliptic, so that Ff 2. At what time does Aldebaran set heliacally at New-York? 3. At what time of the year does Arcturus rise heliacally at Washington city? 4. At what time does Procyon rise and set heliacally at London? 5. How many years will elapse from 1810, before Sirius will rise heliacally on Christmas day, at Cairo, in Egypt, allowing the precession of the equinoxes to be 50. seconds? PROB. 34. The latitude of the fllace and day of the month being given, tojind all those stars that rise and set achronically, cosmically, and heliacally. Rule. Rectify the globe for the latitude: then, 1. for the achronical rising and setting. Bring the sun's place in the ecliptic to the western edge of the horizon; then all the stars along the eastern edge will rise achronically, and those along the western will set achronically. 2. For the cosmical rising and setting. Bring the sun's place to the eastern edge of the horizon; then all the stars along that edge of the horizon will rise cosmically, and those along the western edge will set cosmically. 3. for the heliacal rising and setting. Screw the quadrant of alt. in the zenith, turn the globe eastward until the sun's place cuts the quadrant 12 below the horizon; then all the stars of the 1st magnitude along the eastern edge of the horizon will rise heliacally; and by continuing the motion of the globe eastward until the sun's place intersects the quadrant in 13, Ho, 15, &c. below the horizon, you will find all the stars of the 2d, 3d, 4th, &c. magnitudes, which rise heliacally on that day. By turning the globe the arc QR of the circle of depression maybe...show more

Product details

  • Paperback | 234 pages
  • 189 x 246 x 12mm | 426g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236651200
  • 9781236651204