Page:Description and Use of a New Celestial Planisphere.pdf/28

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from 24 hours, and it leaves 7 hours, 34 minutes for the ſhorteſt night under Cancer; by the same rule, you will find this 7 hours, 34 minutes, to be the length of the day under Capricorn, and the 16 hours, 26 minutes, the length of the night as was ſought.

Problem 10. To find the Meridional Altitude of the Sun on the 3d of October. Bring the Sun's place for that day, found by Problem 2d. to the Meridian, viz. 10° of Libra, and you will find 34° 40' Altitude, by the ſcale of Meridional Altitude, as required.

Problem 11. To find the Meridional Altitude of the fixed Stars, Fomahaut and Lyra. Bring them reſpectively to the Meridian, and you will find Fomahaut hath 7° 39' Altitude, and Lyra 77° 4', and Canis Minor hath 44° 37' Meridional Altitude.

Problem 12. What is the Zenith diſtance of the Sun on May 13th, at noon? Find the Sun's place 22° of Taurus, bring it to the Meridian, and it hath 56° 30' Meridional Altitude; ſubtract this from 90°, and the remainder 33° 30', is the Zenith diſtance required.

Problem 13. To find the Sun's Amplitude at riſing, on the 15th of February. Bring the Sun's place 10s 27° to the Eaſtern part of the Horizon, and you will ſee it interſect the Amplitude of 21° towards the South, the ſame with any Star or Planet.

Problem 14. To find the Right Aſcenſion and Decli-