Year. Lum Month D H MAPM NOTANDA. 7 34 AM 0 35 PM Annular over a large S. sec4 57 AM [tion of the U. 5 10 PM Visible in the W. part of the [Union. Nov. 30 2 38 PM Total. Charleston, S. C. * 15 11 50 PM Those with the asterisk are What day and hour in 1831 will there be an annular eclipse? Where? When will there be another total solar eclipse in the United States? Where? 1865 D April Oct. 25 4 21 A M 10 11 29 P M Very small. 4 5 50 P M Very small. 19 10 27A MAnnular at Wilmington, S. C.* 1866 March 40 11 30 P M Total. 1870 1871 Jan. 5P M Total over a southern section [of the Union. 6 4 9P MMoon rises partially eclipsed. 15 0 29A M Very small. 12 6 23 A MCom. 4h. 34'. 25 2 37 A MIN. total. [w. s. Total in the 1872 ) Nov. 6 12A M Annular at Boston.* 1878 Feb. July 2P MTotal. Moon rises eclipsed. 58 A M 6 17 5 29 5 35 P M The remainder of the eclipses for the 19th Cen tury, as seen at the CAPITOL, may be given sum marily, thus: In the Years 1885, 1886, 1889, 1892, 1897, 1990, there will be solar eclipses; in 1886 two. The lunar eclipses will be 18 in number, 6 of which will be total. No total solar eclipse is calculated for the capital of France in the nineteenth century. The eclipse of 1906 which has been described, as so intensely interesting a scene in New-England, was but about 4 Digits eclipsed at Paris. The only annular eclipse there this century, will be in 1847. CHAPTER XIII. DAY AND NIGHT. THE vicissitudes of light and darkness, heat ana cold, are so familiar to us, that we think little of their recurrence. But WISDOM and BENEVOLENCE are eminently conspicuous, in the admirable simplicity of their causes. The Sun and the other celestial bodies, appear to rise in the east, and set in the west. This apparent motion in them, is caused by the real motion of the earth on its axis. A trifle more than one rotation constitutes a day, because of the Earth's motion round the Sun. Three hundred and sixty-six rotations are required to give 365 days. About the 20th of March and the 23d of Is any total solar eclipse computed for Paris this century? When will an annular one occur there? What is the apparent daily motion of the heavenly bodies? What occasions it? How many rotations of the Earth in 365 days? - Why? September, were we under the equator we should at noon see the Sun vertical, or directly over head. Then the northern and southern hemispheres would be equally illuminated, and the days and nights would be equal in length quite over the Globe. For this reason these periods are called equinoxes. If the Equator coincided with the Ecliptic, as seen in Plate v. Figure 1, there would be no variation in the length of days, and no change of seasons. But these make with each other, an angle of 23° 28'; consequently from the vernal equinox in March, till about the 20th of June, which is called the summer solstice, the Sun appears to advance to the north still at the Equator the Sun will be twelve hours above, and 12 hours below the horizon. But north of the Equator, it will be more than 12 hours above the horizon; at the Arctic pole 6 months; at the Arctic circle from 12 to 24 nours. In Latitude from 40° to 43°, the longest days will be from 15 to 15 hours. The Sun will appear to rise in the north east, and set in the north west. The twilight will be seen till 9, P. M. and by 3, A. M. In the 60th degree of Latitude, the Sun will be 18 hours above the horizon, and the twilight will not cease to be visible. At midnight its place will be due north. When the days are longest, the nights of course will be shortest. The vicissitudes in the length of the days in the southern hemisphere will be similar, but in the other, six months. When do the equinoxes occur? Why called equinoxes? What occasions the inequality in the length of days? What is the greatest length in the days at the Equator?-between 40° and 430 of north Latitude ?-at the 600?-between the Arctic circle and the pole? |