. Elementary physical geography;. of time, but practically thischange may be neglected; practically the axis is alwaysparallel to itself. The north end of the axis if prolongedwould extend nearly in the direction of a star namedPolaris; this star is called the north, or pole star. If the earths axis were perpendicular to the plane of itsorbit, each place on the earths surface would have anunvarying season. It would be always mild in mid-lati-tudes, and equally cold in the same latitudes of polarregions. THE EARTH AMONG PLANETS 17 With an inclined axis, however, the case is June (s
. Elementary physical geography;. of time, but practically thischange may be neglected; practically the axis is alwaysparallel to itself. The north end of the axis if prolongedwould extend nearly in the direction of a star namedPolaris; this star is called the north, or pole star. If the earths axis were perpendicular to the plane of itsorbit, each place on the earths surface would have anunvarying season. It would be always mild in mid-lati-tudes, and equally cold in the same latitudes of polarregions. THE EARTH AMONG PLANETS 17 With an inclined axis, however, the case is June (see diagram below) the suns rays are almost ver-tically on mid-latitude parts of the Northern Hemisphere,while in the corresponding latitudes of the SouthernHemisphere they are very oblique. At this season, there-fore, the Northern Hemisphere receives more light andmore heat than the Southern. Six months later the con-ditions are reversed; the vertical rays are oh the SouthernHemisphere, while on the Northern they are oblique. In.
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