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 |
Z wnętrza książki
Wyniki 1 - 5 z 74
Strona 20
... directions . Vertical circles are those which pass through the poles of the horizon , ( the zenith and nadir , ) perpendicular to it . The meridian is that vertical circle which passes through the north and south points . The prime ...
... directions . Vertical circles are those which pass through the poles of the horizon , ( the zenith and nadir , ) perpendicular to it . The meridian is that vertical circle which passes through the north and south points . The prime ...
Strona 22
... direction , making an angle with the plane itself of sixty - six and a half degrees . The equator , therefore , must be turned the same dis- tance out of a coincidence with the ecliptic , the two circles making an angle with each ...
... direction , making an angle with the plane itself of sixty - six and a half degrees . The equator , therefore , must be turned the same dis- tance out of a coincidence with the ecliptic , the two circles making an angle with each ...
Strona 26
... direction , will form the meridian , and several other great circles drawn through the poles , and of course perpendicularly to the equator , will be secondaries to the equator , constituting meridians , or hour circles . A great circle ...
... direction , will form the meridian , and several other great circles drawn through the poles , and of course perpendicularly to the equator , will be secondaries to the equator , constituting meridians , or hour circles . A great circle ...
Strona 39
... directions for using the telescope . Some states of weather , even when the sky is clear , are far more favorable for astronomical observation than others . After sudden changes of temperature in the atmosphere , the medium is usually ...
... directions for using the telescope . Some states of weather , even when the sky is clear , are far more favorable for astronomical observation than others . After sudden changes of temperature in the atmosphere , the medium is usually ...
Strona 54
... direction of this line would be the same , whether it were made in the Summer or in the Winter ; but it is expedient to draw it about the fifteenth of June , for then the shadow alters its length most rapidly , and the mo- ment of its ...
... direction of this line would be the same , whether it were made in the Summer or in the Winter ; but it is expedient to draw it about the fifteenth of June , for then the shadow alters its length most rapidly , and the mo- ment of its ...
Inne wydania - Wyświetl wszystko
Kluczowe wyrazy i wyrażenia
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