The Description and Use of a New Portable Orrery: On a Most Simple Construction, Representing in Two Parts the Motions, and Phaenomena of the Planetary Systems ... To which is Prefixed, a Short Account of the Solar System, Or the True System of the Worldsold, 1784 - 36 pagina's |
Overige edities - Alles bekijken
The Description and Use of a New Portable Orrery: On a Most Simple ... Sir William Jones, Sir Geen voorbeeld beschikbaar - 2016 |
The Description and Use of a New Portable Orrery: On a Most Simple ... Geen voorbeeld beschikbaar - 2020 |
Veelvoorkomende woorden en zinsdelen
20th of March Aftronomers alfo alſo apparent Magnitude appear boundary wire brafs brass ball called Cancer Capricorn cauſes Comets confequently Conftruction day and night defcribed diſcovered diſtance diſtinguiſh Eaft Earth Earth and Moon Earth round east to west Ecliptic circle Ephemeris fame feconds feen feven fhadow fhew fhewn fide fign firft firſt fituation fixed Stars fmall Ecliptic fome fometimes frame of wheels fuch fuppofed Georgium Sidus Heavens Heliocentric Hemiſphere Jupiter learner lefs length of day leſs Mercury millions of miles moft moſt move the frame muſt Node North Pole obfervations oppofite orbit Orrery perfon Phænomena Philofopher Planetarium Planetary Syſtem Planets pofition Polar Circle real diameter refpect repreſent Retrogade revolves round its Axis round the Sun Saturn ſcrewed Seafons ſee ſeen ſhe ſmall Solar Syftem Tellurian thefe theſe thofe thoſe thouſand Tropic of Cancer turn the frame turning the Earth uſe Venus Weft
Populaire passages
Pagina 22 - It fhews, that as the Planets move in Circular Orbits about the Central Earth, they ought at all Times to be of the fame apparent Magnitude ; whereas, on the Contrary, we obferve...
Pagina 18 - God laid the foundation of the earth, and that the heavens are the...
Pagina 15 - ... that the sun is, each to bestow light, heat, and vegetation on a certain number of inhabited planets, kept by gravitation within the sphere of its activity. What an august, what an amazing conception, if human imagination can conceive it, does this give of the works of the Creator!
Pagina 17 - What an august ! what an amazing conception, if human imagination can conceive it, does this give of the works of the Creator ! Thousands of thousands of suns, multiplied without end, and ranged all around us, at immense distances from each other, attended by ten thousand times ten thousand worlds...
Pagina 13 - ... and five times that of the earth : for by the calculations of M. de la Lande, contained in a letter he has favoured me with, the diftance of the Georgium Sidus is dated at 18,913, that of the earth being i.
Pagina 23 - Mercury never to be more than 21°, and Venus 47°, from the Sun. (3.) That the Planets, and efpecially Mars, will be fometimes much nearer to the Earth than at others, and therefore muft appear much larger at one Time than at another. (4.) You will fee that the Planets cannot appear at the Earth to move with an uniform Velocity ; for when neareft, they appear to move fafter, and flower when moft remote.
Pagina 13 - Sidus is ftated at iS.ghj, that of the earth being i. And if we take the latter to be feen, at the fun, under an angle of 17...
Pagina 25 - ... in a minute or two, reprefent to yourfelf the true appearance of the Planetary Syftem, juft as it really is...
Pagina 23 - Velocity ; for when neareft, they appear to move fafter, and flower when moft remote. (5.) You will obferve the Planets will appear at the Earth to move fometimes directly from Weft to Eaft ; and then to become retrograde from Eaft to Weft ; and between both, to be Stationary, or without any apparent Motion at all. Which Things all correfpond exactly with Obfervations, and fully prove the TRUTH of this excellent Syftem.
Pagina 17 - Saturn's orbit ; and yet, at that amazing diftance, they are incomparably nearer to the fun than to any of the...