The New American Grammar of the Elements of Astronomy: On an Improved Plan: in Three Books. I. The Use of the Terrestrial Globe in the Solution of Geographical and Astronomical Problems. II. The Use of the Celestial Globe in the Solution of Problems, Relative to the Sun, Planets, and Fixed Stars. III. The Solar System, and the Firmament of Fixed Stars. The Whole Systematically Arranged and Scientifically Illustrated; with Several Cuts and Engravings; and Adapted to the Instruction of Youth in Schools and AcademiesCollins and Hannay, 1827 - 375 pages |
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Page 34
... day , and those of the south pole continual night ; and while he is describing the southern signs , the ... days and nights are unequal . 5. The inhabitants of the earth have different names assigned to them by geographers ...
... day , and those of the south pole continual night ; and while he is describing the southern signs , the ... days and nights are unequal . 5. The inhabitants of the earth have different names assigned to them by geographers ...
Page 35
... days with one is equal to the length of the night with the other . They have ... nights of the same length ; but when it is noon with the one , it is ... days and nights ; but all of these at con- trary times , it being day to ...
... days with one is equal to the length of the night with the other . They have ... nights of the same length ; but when it is noon with the one , it is ... days and nights ; but all of these at con- trary times , it being day to ...
Page 77
... days of the month , corres- ponding to the sun's declination for every day ... nights , & c . EXAMPLES . 1. What is the sun's longitude and declination on ... days : March 20 , April 19 , May 21 , June 21 , July 23 , August 23 ...
... days of the month , corres- ponding to the sun's declination for every day ... nights , & c . EXAMPLES . 1. What is the sun's longitude and declination on ... days : March 20 , April 19 , May 21 , June 21 , July 23 , August 23 ...
Page 84
... days and nights , and the vicissitudes of the seasons . RULE . Rectify the globe for every degree of the sun's ... days are longer than the nights in those lati- tudes ; but if the arcs , above the horizon , are less than those ...
... days and nights , and the vicissitudes of the seasons . RULE . Rectify the globe for every degree of the sun's ... days are longer than the nights in those lati- tudes ; but if the arcs , above the horizon , are less than those ...
Page 85
... day and night is occasioned merely by the uniform rotation of the earth on its axis . For , as any meri- dian ... days and nights , and the vicissitudes of the seasons . EXAMPLES . 1. It is required to show at one view the length ...
... day and night is occasioned merely by the uniform rotation of the earth on its axis . For , as any meri- dian ... days and nights , and the vicissitudes of the seasons . EXAMPLES . 1. It is required to show at one view the length ...
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Common terms and phrases
21st of June analemma angle aphelion appear Aries astronomers axis azimuth brazen meridian bring the given bring the sun's called celestial globe climate comet constellation Cor Caroli days and nights difference diurnal motion earth east eastward ecliptic elevated equal equator equinoctial point equinox find the sun's fixed stars given day given place globe westward greatest heavens hemisphere Hence horizon hour circle inferior conjunction inferior planet inhabitants Jupiter latitude length longest day longitude mean distance Mercury meridian altitude minutes moon nearly New-York node noon north latitude north or south north pole number of degrees o'clock oblique observed orbit parallax parallel of latitude perihelion polar circles principal star Prob PROBLEM quadrant of altitude Rectify the globe remarkable stars retrograde revolution right ascension rise and set second magnitude set the index solar south pole southern sun rise sun's declination sun's place supposed surface telescope tion tropic tude turn the globe Venus zenith
Popular passages
Page 25 - Absolute, true, and mathematical time, of itself, and from its own nature, flows equably without relation to anything external, and by another name is called duration: relative, apparent, and common time, is some sensible and external (whether accurate or unequable) measure of duration by the means of motion, which is commonly used instead of true time; such as an hour, a day, a month, a year.
Page 252 - ... us on to suppose that it is most probably also inhabited, like the rest of the planets, by beings whose organs are adapted to the peculiar circumstances of that vast globe.
Page 365 - ... in diameter. The star is perfectly in the centre, and the atmosphere is so diluted, faint, and equal throughout, that there can be no surmise of its consisting of stars ; nor can there be a doubt of the evident connection between the atmosphere and the star. Another star not much less in brightness, and in the same field with the above, was perfectly free from any such appearance.
Page 18 - The AMPLITUDE of any object in the heavens is an arc of the horizon, contained between the centre of the object when rising, or setting, and the east or west points of the horizon.
Page 252 - ... show that heat is produced by the sun's rays only when they act on a calorific medium: they are the cause of the production of heat, by uniting with the matter of fire which is contained in the substances that are heated...
Page 59 - Antipodes)o the inhabitants of any place. RULE. Place the two poles of the globe in the horizon, and bring the -given place to the eastern part of the horizon ; then, if the given place be in north latitude, observe how many degrees it is to the northward of the east point of the horizon ; the same number of degrees to the southward of the east point will show the...
Page 57 - Find the sun's declination and elevate the north or south pole, according as the declination is north or south so many degrees above the horizon, as are equal to the sun's declination ; bring the given place to the brass meridian, and set the index of the hour circle to 12. Turn the globe eastward till the given place comes to the horizon, and the index will shew the time of the sun's rising.
Page 60 - EleVate the north or south pole, according as the latitude is north or south, so many degrees aboVe the horizon as are equal to the latitude of the gtVen place.
Page 12 - The tropics are two small circles parallel to the equator at the distance of 23° 28' from it ; the northern, is called the tropic of cancer, and the southern, the tropic of Capricorn.