 | Benjamin Martin - Science - 1772 - 516 pages
...Earth which lies under the Degree of the Ecliptic in which the Sun appears at any Time. Thirdly, That the Axis of the Earth is not perpendicular to the Plane of the Ecliptic, but inclined thereto in an Angleof 66, f ; as I fhewed you in the Sphere. — Fourthly,... | |
 | 1794 - 540 pages
...30° var. 48° 35 go - - i 43 70" - - 6 43 50 - - 24 24 4° - - 35 55 20 - - 6г io - - 74 53 But as the axis of the earth is not perpendicular to the plane of its orbit, but inclines under an angle of 23° 29', the angle of the axis of the pyrotic curve with that of the... | |
 | George Adams - Physics - 1794 - 600 pages
...and nights, and but one feafon of the year ; but as this is not the cafe, we may fairly infer, that the axis of the earth is not perpendicular to the plane of it's orbit. But if the earth's axis be inclined to the plane 'of the ecliptic when the earth is in... | |
 | John Dougall - 1810 - 660 pages
...the plane of the ecliptic does not now coincide with the plane of the equator of the earth ; that is, the axis of the earth is not perpendicular to the plane of the ecliptic, being inclined to it in an angle which, in 1769, was ascertained, by accurate observations,... | |
 | George Adams - Astronomy - 1812 - 586 pages
...nights, and but one ti season of the year ; but, as this is not the case, we may fairly infer, that the axis of the earth is not perpendicular to the plane of its orbit. But if the earth's axis be inclined to the plane of the ecliptic, when the earth is in the situation... | |
 | George Adams - Astronomy - 1812 - 552 pages
...SEASONS OF THE YEAR. 85 season of the year; but, as this is not the case, we may fairly infer, that the axis of the earth is not perpendicular to the plane of its orbit. But if the earth's axis be inclined to the plane of the ecliptic, when the earth is in the situation... | |
 | Mrs. Marcet (Jane Haldimand), Thomas P. Jones - Physics - 1826 - 286 pages
...I think, be able to explain to you the cause of the variation of the seasons, and the difference in the length of the days and nights in those seasons;...plane of the earth's orbit, and this little globe, the earth ; through this I have passed a wire, representing its axis and poles. In moving round the... | |
 | Levi Washburn Leonard - New Hampshire - 1827 - 398 pages
...the ecliptic, but makes an angle with it of twenty-three degrees and twenty-eight minutes,, that is, the axis of the earth is not perpendicular to the plane of the ecliptic, but is inclined twenty-three degrees and twenty-eight minutes. Thus we have two great... | |
 | Levi Washburn Leonard - Science - 1830 - 350 pages
...the ecliptic, but makes an angle with it of twenty-three degrees and twenty-eight minutes, that is, the axis of the earth is not perpendicular to the plane of the ecliptic, but is inclined twenty-tjiree degrees and twenty-eight minutes. Thus we have two great... | |
 | Physics - 1832 - 640 pages
...shortened by a few lines ; and at the poles, it must be proportionally lengthened. We shall now explain the variation of the seasons, and the difference of...earth is not perpendicular to the plane of its orbit ; in other words, its axis does not move round the sun in an upright position, but slanting or oblique.... | |
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We shall now explain the variation of the seasons, and the difference of the length of the days and nights in those seasons — both effects resulting from the same cause. 
