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 91
Strona 37
... tion . Indeed , most of Herschel's discoveries were made with his small telescopes ; and although , for cer- tain rare purposes , powers were applied which magni- fied seven thousand times , yet , in most of his observa- tions , powers ...
... tion . Indeed , most of Herschel's discoveries were made with his small telescopes ; and although , for cer- tain rare purposes , powers were applied which magni- fied seven thousand times , yet , in most of his observa- tions , powers ...
Strona 55
... tion . The circle is of solid metal , usually of brass , and it is strengthened by numerous radii , which keep it from warping or bending ; and these are made in the form of hollow cones , because that is the figure which unites in the ...
... tion . The circle is of solid metal , usually of brass , and it is strengthened by numerous radii , which keep it from warping or bending ; and these are made in the form of hollow cones , because that is the figure which unites in the ...
Strona 59
... tion of the earth on its axis , which , by the most exact observations , is found to be always the same . I have anticipated a little of this subject , in giving an account of the transit instrument and clock , but I propose , in this ...
... tion of the earth on its axis , which , by the most exact observations , is found to be always the same . I have anticipated a little of this subject , in giving an account of the transit instrument and clock , but I propose , in this ...
Strona 61
... tion of time . If one clock is so constructed as to keep exactly with the sun , going faster or slower , according as the lengths of the solar days vary , and another clock 6 L. A. is regulated to mean time , then the difference of TIME ...
... tion of time . If one clock is so constructed as to keep exactly with the sun , going faster or slower , according as the lengths of the solar days vary , and another clock 6 L. A. is regulated to mean time , then the difference of TIME ...
Strona 72
... tion , he concluded that the distance through the earth , in the direction of the equator , is greater than that in the direction of the poles . He estimated the difference to be about thirty - four miles . But it was soon afterwards ...
... tion , he concluded that the distance through the earth , in the direction of the equator , is greater than that in the direction of the poles . He estimated the difference to be about thirty - four miles . But it was soon afterwards ...
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