## Cyclomathesis: Or, An Easy Introduction to the Several Branches of the Mathematics]., Volume 81769 |

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Cyclomathesis: Or, an Easy Introduction to the Several Branches of ..., Volume 2 William Emerson No preview available - 2016 |

### Common terms and phrases

aftronomical alfo alſo altitude angled fpherical triangle aphelion apogee apparent arch argument of latitude axis azimuth becauſe Cafe centripetal force circle cofine comet confequently declination defcribe degrees diameter difference diſtance diurnal motion earth earth's orbit eaſt ecliptic equal equation equinoctial excentricity fame fatellite fecond feem feen femidiameter fhadow fhew fide fince find the angle firſt fome fouth ftar fubtract fuch fun and moon fun's place fuppofe fyziges given greateſt heliocentric horary motion horizon hour increaſe inferior planet interfect Jupiter known latitude leffer lefs Likewife longitude mean anomaly mean motion meridian moon move muſt node obfervations oblique oppofite orbit paffing thro parallax parallel perihelion planet pofition pole PROB Prop quadrant quadratures radius refraction rifes right afcenfion right angled ſpherical ſmall ſtars teleſcope thefe theſe tion tranfit true anomaly velocity Venus weft whence zenith

### Popular passages

Page 288 - Moon, the inclination of the Moon's orbit, to the plane of the ecliptic, the...

Page 16 - Distribution of Radiation. tance of the earth from the sun is continually varying. At perihelion on 1st January the distance is 91,340,000 miles, and at aphelion on 1st July the distance is 94,460,000 miles, a difference of 3,120,000 miles. The mean distance is 92,900,000 miles. Inclination of the Axis of Rotation of the Earth to the Plane of its Orbit. — Further, the earth is not a regular sphere but a spheroid, so that the attraction of the sun does not pass exactly through the centre. The result...

Page 46 - The latitudes of places are counted from the equator, northward and southward, and the longitude of places are reckoned upon it, eastward and westward. The equator, when referred to the heavens, is called the equinoctial ; because when the sun appears in it, the days and nights are equal all over the world, viz. 12 hours each. The...

Page 96 - ... therefore the velocity of light, is to the velocity of the earth in its orbit ; as radius to...

Page i - London, 1765. [Dd. 1. 11.] EMERSON (William) A System of Astronomy ; containing the Investigation and Demonstration of the Elements of that Science. 8vo. London, 1769. [Dd. 4. 45.] Another Copy. 8vo. Works, Vol. VIII. [E. 25. 21.] FERGUSON (James) Astronomy explained upon Sir Isaac Newton's Principles, and made easy to those who have not studied the Mathematics. 4to. London, 1773.

Page 274 - That is, the force by which the moon is retained in her orbit : is to the increase of centripetal force by the sun's action : : PP : pp : : 178-725 : 1.

Page 340 - HO the horizon, EC the equinoctial, EL the ecliptic, Z the zenith, P the pole, S and M the places of the fun and moon in conjunction, PSD the fun's me-, ridian.

Page 4 - ... parabolic curves, and then they never return. Thefe •move in all manner of directions round the fun ; fome the fame way as the planets, and fome the contrary way, they cut the plane of the earth's orbit, in all forts of -angles, fome greater and fome lefler.