The Planetarium and Astronomical Calculator |
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Page 8
... , situations , and distances still remain the same ; and a telescope which magnifies above 200 times , does not sensibly magnify them ; which proves them to be at least , one hundred $ Sec . 1 . Of Astronomy in General .
... , situations , and distances still remain the same ; and a telescope which magnifies above 200 times , does not sensibly magnify them ; which proves them to be at least , one hundred $ Sec . 1 . Of Astronomy in General .
Page 9
... telescopes , we discover thousands of stars which are entirely invisible , without the aid of such instruments , and the better our glasses are , the more become visible . We therefore can set no limits to their numbers , or to their ...
... telescopes , we discover thousands of stars which are entirely invisible , without the aid of such instruments , and the better our glasses are , the more become visible . We therefore can set no limits to their numbers , or to their ...
Page 13
... telescopes we observe the Moon to be full of high mountains , large vallies , and deep cavities . These sim- ilarities leave us no room to doubt , but that all planets , Moons and Systems , are designed to be commodious habitations for ...
... telescopes we observe the Moon to be full of high mountains , large vallies , and deep cavities . These sim- ilarities leave us no room to doubt , but that all planets , Moons and Systems , are designed to be commodious habitations for ...
Page 19
... telescope , appears in all the various shapes of the Moon , which is a plain proof that he receives , ( like the Moon , ) all his light from the Sun. That he moves round the Sun in an orbit , within the orbit of the earth , is also ...
... telescope , appears in all the various shapes of the Moon , which is a plain proof that he receives , ( like the Moon , ) all his light from the Sun. That he moves round the Sun in an orbit , within the orbit of the earth , is also ...
Page 37
... telescope appears double . It is inclined 30 degrees to the ecliptic , and is about 21 thousand miles in breadth ; which is equal to its distance from Saturn on all sides . This ring performs a revolution on its axis in the same space ...
... telescope appears double . It is inclined 30 degrees to the ecliptic , and is about 21 thousand miles in breadth ; which is equal to its distance from Saturn on all sides . This ring performs a revolution on its axis in the same space ...
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Common terms and phrases
angle apogee approach of centres Aries ascending node Astronomers attractive power body calculated centrifugal force Comets conjunction consequently descending diameter as seen difference Dionysian Period Dominical letters earth Earth's shadow enter Table equal equator equinox fall fixed stars full Moon Geocentric longitude given Golden Number gravity grees H M. S. half Heavens heliocentric Herschel horary motion horizon Interrogations for Section Jupiter light longitude lunar Lunar Eclipses mean motion mean new Moon Middle apparent millions of miles minutes Moon in March Moon's mean anomaly Moon's node Moon's orbit move nearer north pole Old Style opposite parallax penumbra perigee planet projectile force rays revolves rise round the Sun satellites Saturn seconds semi-diameter signs and degrees Solar System south pole subtract Sun and Moon Sun's distance Sun's mean anomaly Sun's mean distance Sun's true surface syzygy tance telescope Tides tion velocity Venus visible
Popular passages
Page 248 - Aries the Ram, Taurus the Bull, Gemini the Twins, Cancer the Crab, Leo the Lion, Virgo the Virgin, Libra the Balance, Scorpio the Scorpion, Sagittarius the Archer, Capricornus the Goat, Aquarius the Waterbearer, and Pisces the Fishes...
Page 14 - 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, all in rapid motion, yet calm, regular, and harmonious, invariably keeping the paths prescribed them ; and these worlds peopled with myriads of intelligent beings, formed for endless progression in perfection and felicity.
Page 2 - ANSLEY, of the said district, hath deposited in this office the title of a book, the title of which is in the words following, to wit : " Elements of Literature ; or, an Introduction to the Study of Rhetoric and Belles Lettres.
Page 78 - This is the same as saying that when a ray of light passes out of one medium into another, the...
Page 253 - October in 1582, to make the /Equinox fall on the 21st of March, as it did at the time of that council. And, to prevent the like variation for the future, he ordered that three days...
Page 14 - Vast concave ! ample dome ! wast thou design'd A meet apartment for the Deity ? — •Not so; that thought alone thy state impairs, Thy lofty sinks, and shallows thy profound, And straitens thy diffusive ; dwarfs the whole, And makes a universe an orrery.
Page 124 - Differences of local situation cause great differences as to the height to which the tide rises. In the central parts of the ocean the height is comparatively small, seldom exceeding three feet, but in rushing up contracted channels the...
Page 257 - Sun is a revolution of twenty-eight years, in which time the days of the months return again to the same days of the week ; the Sun's place to the same signs and degrees of the ecliptic on the same months and days...
Page 112 - ... because she is always in that sign which is diametrically opposite to the sun at the time of full moon. When the sun is at his greatest depression below the horizon, being then in Capricorn, the moon is at her FIRST QUARTER in Aries : FULL in Cancer ; and at her THIRD QUARTER in Libra : and as the beginning of Aries is the rising point of the ecliptic, Cancer the highest, and Libra the setting point, the moon rises at her FIRST QUARTER in Aries, is most elevated above the horizon, and FULL in...
Page 9 - Huygens carried his thoughts so far, as to believe it not impossible that there may be stars at such inconceivable distances, that their light has not yet reached the earth since its creation ; although the velocity of light be a million of times greater than the velocity of a cannon bullet ; and, as Mr.