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But in proceeding in an _oblique_ sphere, from rising or setting to _either_ meridian, the time occupied must be unequal; and in a right sphere, equal, because the entire portions above the earth are, in a _right_ sphere only, equal to those below the earth; whence, for instance, in a right sphere, whatever stars may be together on the meridian must also all rise and set together, until their progress becomes perceptible by the poles of the zodiac; while, on the other hand, in an oblique sphere, whatever stars may be together on the meridian can neither all rise together nor set together; for the more southern stars must always rise later than those which are more northern, and set earlier.[285] [285] On this side of the equator.