Letters on Astronomy: Addressed to a Lady; in which the Elements of the Science are Familiarly Explained in Connexion with Its Literary HistoryMarsh, Capen, Lyon and Webb, 1841 - 419 |
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Strona 27
... ring , as a wire bent into a circle , and hold it in different positions before the eye . If we hold it parallel to ... ring to be near a perpendicular wall , and the eye to be removed at such a distance from it , as not to distinguish ...
... ring , as a wire bent into a circle , and hold it in different positions before the eye . If we hold it parallel to ... ring to be near a perpendicular wall , and the eye to be removed at such a distance from it , as not to distinguish ...
Strona 28
... ring as a circle , when perpendicular to a straight line joining the centre of the ring and the eye , or as an ellipse , when oblique to this line , or as a straight line , when its edge is towards us . It is in this manner that the ...
... ring as a circle , when perpendicular to a straight line joining the centre of the ring and the eye , or as an ellipse , when oblique to this line , or as a straight line , when its edge is towards us . It is in this manner that the ...
Strona 119
... ring , to represent the sun in the centre of the earth's orbit , and an apple with a knittingneedle running through it in the direc- tion of the stem . Run a knife around the central part of the apple , to mark the situation of the ...
... ring , to represent the sun in the centre of the earth's orbit , and an apple with a knittingneedle running through it in the direc- tion of the stem . Run a knife around the central part of the apple , to mark the situation of the ...
Strona 120
... ring , always hold- ing the axis inclined at the same angle to the plane of the ring , and always parallel to itself . You will find that there will be two points in the circuit where the plane of the equator , that you had marked ...
... ring , always hold- ing the axis inclined at the same angle to the plane of the ring , and always parallel to itself . You will find that there will be two points in the circuit where the plane of the equator , that you had marked ...
Strona 155
... rings , before mentioned , a wire representing its axis , one corresponding to the axis of the ecliptic , the other to that of the equator , the extremity of each being the pole of its circle . As the ring denoting the equator turns ...
... rings , before mentioned , a wire representing its axis , one corresponding to the axis of the ecliptic , the other to that of the equator , the extremity of each being the pole of its circle . As the ring denoting the equator turns ...
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angle appear ascertain astronomers atmosphere attraction axis called celestial centre circle comet conjunction constellation degrees diameter direction discovery disk distance diurnal motion doctrine double stars earth ecliptic equal equator equinox exhibited fact fixed stars force Galileo globe gravity greater greatest half Halley's comet heavenly bodies heavens Hence Herschel horizon hundred inferior conjunction instrument John Herschel Jupiter Kepler latitude laws length less light longitude lunar lunar eclipse magnitude measure Mercury meridian meteors millions of miles minutes moon moon's motion move Nature nearer nearly node objects observations opposite orbit parallax passing perihelion period phenomena planetary planets pole respect revolve right ascension ring round satellites Saturn seen shadow side space spectator sphere sun's superior planets supposed surface telescope thousand tides tion truth Tycho Tycho Brahe universal gravitation Uranus velocity Venus vernal equinox visible west to east