An Introduction to the True Astronomy: Or, Astronomical Lectures, Read in the Astronomical School of the University of Oxford. By John Keill, ...Samuel Richardson, 1739 - 396 páginas |
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Página 2
... Line F CH , and therefore at H So alfo the Image of the Point E will be in the Line E C L , at the Point L ; for the Rays of Light will , by the pellucid and clear Coats and Humours of the Eye , be fo refracted , that all those Rays ...
... Line F CH , and therefore at H So alfo the Image of the Point E will be in the Line E C L , at the Point L ; for the Rays of Light will , by the pellucid and clear Coats and Humours of the Eye , be fo refracted , that all those Rays ...
Página 3
... Line C F there be another Object M , which is likewife at a great Distance from us , and this Object be carried from M to N , its Motion will appear to be the fame with that of the Ob- ject F ; for the Way of both will appear the fame ...
... Line C F there be another Object M , which is likewife at a great Distance from us , and this Object be carried from M to N , its Motion will appear to be the fame with that of the Ob- ject F ; for the Way of both will appear the fame ...
Página 4
... Line FE , or in the circular Arch FPE , or in any other curve Line FQE ; when it comes to the Line CE , its apparent Motion will always be seen to be the fame , while the Angle F C E remains the fame ; but when the Angle F CE is ...
... Line FE , or in the circular Arch FPE , or in any other curve Line FQE ; when it comes to the Line CE , its apparent Motion will always be seen to be the fame , while the Angle F C E remains the fame ; but when the Angle F CE is ...
Página 6
... Line perpendicular to the Horizon will país : And it is in this Line all heavy Bodies endeavour to defcend , and according to which we ftand upright . By this Method the Sailors at Sea find out the Height of the Sun by the Angle which ...
... Line perpendicular to the Horizon will país : And it is in this Line all heavy Bodies endeavour to defcend , and according to which we ftand upright . By this Method the Sailors at Sea find out the Height of the Sun by the Angle which ...
Página 7
... Line AB will be triple of the Line DE : But if the Distance C B be not only triple of the Distance ef , but also the Angle ACB be double of the Angle dfe , the Object A B will be fextuple of the Object de : For if we fuppofe CM equal to ...
... Line AB will be triple of the Line DE : But if the Distance C B be not only triple of the Distance ef , but also the Angle ACB be double of the Angle dfe , the Object A B will be fextuple of the Object de : For if we fuppofe CM equal to ...
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An Introduction to the True Astronomy: Or, Astronomical Lectures,: Read in ... John Keill Visualização integral - 1739 |
An Introduction to the True Astronomy: Or, Astronomical Lectures,: Read in ... John Keill Visualização integral - 1739 |
An Introduction to the True Astronomy: Or, Astronomical Lectures, Read in ... John Keill Pré-visualização indisponível - 2018 |
Palavras e frases frequentes
Æquator Aftronomers alfo Altitude Angle Aphelion appear Arch Axis becauſe Body called Center Circle Circle of Latitude Co-fine Comet conftantly Conjunction Courſe defcribe Degrees Diameter Difference diftant Disk Diſtance diurnal Motion Eaft Earth Eccentrick Eclipfe Ecliptick equal Equator Equinoctial fame feem feen fhall fhew fhining fhould fince firft firſt fixed Stars fmall fome fometimes ftance ftill fubftracted fuch fuppofe greateſt Heavens Horizon Hours increaſe inferior Planets Interfection itſelf Jupiter Latitude Lect Lecture lefs likewife Longitude Mars mean Anomaly Meaſure Meridian Minutes Moon Moon's moſt move muft muſt Nodes Number obferved oppofite Orbit paffing Parallax parallel Penumbra Perihelion perpendicular Place Planet Plate Pofition Point Pole Proportion Quadrant Radius reft reprefent rifes right Afcenfion right Line round the Sun Saturn ſeen Semidiameter Shadow ſhall Sine ſmall Spectator Sun's Teleſcope thefe thence theſe thofe thro tion Triangle true true Anomaly Velocity Venus Vertex vifible Weft whofe
Passagens conhecidas
Página 51 - The common names, or meaning of these words, in the same order, are, the Ram, the Bull, the Twins, the Crab, the Lion, the Virgin, the Scales, the Scorpion, the Archer, the Goat, the Waterer, and the Fishes. Fig. 183. The 12 signs of the zodiac, together with the sun, and the earth revolving around him, are represented at fig.
Página viii - Lord ; for he spake the word, and they were made ; he commanded, and they were created. He hath made them fast for ever and ever ; he hath given them a law which shall not be broken.
Página 220 - When applied to the setting of a star it denotes the entering or iminerging into the sun's rays, and thus becoming lost in the lustre of his beams. A star rises heliacally when, after it has been in conjunction with the sun, and on that...
Página 103 - ... parts appear as it were toothed and cut with innumerable notches and breaks ; and even in the dark part, near the borders of the lucid surface, there are seen some small spaces enlightened by the sun's beams.
Página 368 - ... Sunday of January, in a common year, will show all the Sundays throughout the year, and to whatever days in the rest of the months, that letter is put, these days are all Sundays. If the first day of January be on a Sunday, the next year will begin on Monday, and the Sunday will fall on the seventh day, to which is annexed the letter G, which therefore will be the Sunday letter for that year; the next year beginning on Tuesday, the first Sunday will fall on the sixth of January, to which is adjoined...
Página 104 - Afterwards many more shining spaces are observed to arise by degrees, and to appear within the dark side of the moon, which before they drew near to the confines of light and darkness were invisible, being without any light, and totally immersed in the shadow. The contrary is observed in the decreasing...
Página xiv - Keil observed, our author, with indefatigable pains, for more than forty years, watched the motions of the stars, and has given us innumerable observations of the sun, moon, and planets, which he made with very large instruments...
Página 75 - The true cause of the variation of the seasons consists in the inclination of the axis of the earth to the plane of its orbit; or, in other words, to the ecliptic.
Página 97 - ... nineteen years ; after which time either of the nodes, having receded from any point of the ecliptic, returns to the same again ; and when the moon is in the node, she is also seen in the ecliptic. If the line of nodes were immoveable, that is, if it had no other motion than that whereby it is carried round the sun, it would always look to the same point of the ecliptic, or would keep parallel...
Página 126 - ... is supposed to be divided into twelve equal parts, called digits : in a total eclipse of the luminaries, the whole disc is obscured ; in a partial eclipse, only a part thereof. If we imagine a plane to pass through the centre of the earth, so that the line which joins the centres of the sun and earth, may be perpendicular to this plane, it will make on the surface of the earth a circle, which will separate the illuminated hemisphere of the earth from the dark. This circle, otherwise termed the...