Lectures on Experimental Philosophy, Astronomy, and Chemistry: Intended Chiefly for the Use of Students and Young Persons, Volume 2Longman, 1820 - Astronomy |
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Page 12
... portion of light which the sun diffuses through the atmosphere before his rising and after his setting . The morning twilight , which the ancients distinguished by the name of Aurora , introduces to us the dawn of morning when the sun ...
... portion of light which the sun diffuses through the atmosphere before his rising and after his setting . The morning twilight , which the ancients distinguished by the name of Aurora , introduces to us the dawn of morning when the sun ...
Page 13
... portion as the sun is further from the equator , or has more declination . We must therefore conclude , that to those who live between the equator and one of the poles , or who have an oblique sphere , the length of the twilight must be ...
... portion as the sun is further from the equator , or has more declination . We must therefore conclude , that to those who live between the equator and one of the poles , or who have an oblique sphere , the length of the twilight must be ...
Page 20
... portion of the ecliptic at the di- stance of the moon , along which the shadow of the earth is moving . This shadow is repre- sented by the black circular spots ABCD , which may be conceived to be sections of the cone DCE in fig . 7 ...
... portion of the ecliptic at the di- stance of the moon , along which the shadow of the earth is moving . This shadow is repre- sented by the black circular spots ABCD , which may be conceived to be sections of the cone DCE in fig . 7 ...
Page 21
... portion of her disc will be plunged in the shadow . There will then be a partial eclipse , and if the moon be still nearer to her node , as at the point H , the greater the obscuration will necessarily be . In fine , if in the moment of ...
... portion of her disc will be plunged in the shadow . There will then be a partial eclipse , and if the moon be still nearer to her node , as at the point H , the greater the obscuration will necessarily be . In fine , if in the moment of ...
Page 22
... portion of the ecliptic , and LL a portion of the orbit of the moon , cutting the ecliptic in the point N , at an angle of a little more than five degrees . Then , if in the moment of her con- junction the moon is found in the point F ...
... portion of the ecliptic , and LL a portion of the orbit of the moon , cutting the ecliptic in the point N , at an angle of a little more than five degrees . Then , if in the moment of her con- junction the moon is found in the point F ...
Other editions - View all
Lectures on Experimental Philosophy, Astronomy, and Chemistry ..., Volume 1 G. (George) Gregory No preview available - 2012 |
Lectures on Experimental Philosophy, Astronomy, and Chemistry: Intended ... No preview available - 2019 |
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acid gas alkali alum ammonia animal appears applied atmosphere attraction for water becomes bodies boiling burning called caloric carbonat carbonic acid carbonic acid gas charcoal chemical chemistry chemists clay cold colour combined combustible compound condensed contain converted into vapour copper crystals degree of heat deliquescent dissolved distillation earth eclipse effect effervescence equator evaporation exposed fire flame fluid fluidity freezing furnace fusion glass Hence hydrogen hydrogen gas iron lecture lime liquor magnesia matter melted mercury metals mineral waters mixed mixture moon mucilage muriatic acid nitrat nitric acid nitrogen node obtained orbit oxide oxygen oxygen gas particles phænomenon phosphorus portion potass powder precipitated produced proportion pure resins rises saltpetre saturated sensible heat separated silver small quantity smell soda solid solution sometimes specific gravity spirit of wine stances strata strong substances sulphat sulphuric acid surface tains temperature tion transparent vegetable vessel volatile alkali
Popular passages
Page 1 - ... to the inclination of the axis of the earth to the plane of the ecliptic, and partly to the different positions in which a spectator is placed in different zones of the globe.
Page 22 - An eclipse of the sun can only take place when the moon is in conjunction with the sun, and when she is in one of her nodes, or very near it. Suppose the line EE (fig. 8) to be a portion of the ecliptic, and LL a portion of the orbit of the moon, cutting the ecliptic in the point N, at an angle of a little more than five degrees. Then, if in the moment of her conjunction the moon is found in the point F of her orbit, she will be too far from her node to intercept the sun's light, and cause an eclipse.
Page 86 - ... to combine with the oxygen of the atmosphere, and this oxygen during its combination lets go the caloric with which in the state of air or gas it was combined.
Page 86 - It is of course incombustible, because; its base being already saturated with oxygen, cannot combine with any more.
Page 26 - But the falling back of the line of conjunctions, or oppositions of the sun and moon 28' 12", with respect to the line of the nodes in every period, will wear it out in process of time; and after that it will not return again in less than 12,493 years.
Page 246 - When a sheet of pure tin is immersed in a solution of nitro-muriate of gold, the oxide of gold is precipitated of a purple colour; and, when scraped off and collected, forms the purple powder of Cassius, much employed in enamelling.
Page 25 - ... 225 days; in which time there would always be a regular period of eclipses, if any complete number of lunations were finished without a fraction. But this never happens ; for if both the Sun and Moon should start from a line of conjunction with either of the nodes in any point of the ecliptic, the Sun would perform 18 annual revolutions and 222 degrees over and above, and the Moon 230 lunations and 85...