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The kind of day: The hemisphere world map

As sphere course, most words in -sphere are feminine: atmosphere , an ionosphere, lithosphere , a mesosphere, stratosphere a , a thermosphere, troposphere a . That is, if logic is the logic as to exclude any observation language, at least handy.

Only two words, remarkable intruders, escape the series: a hemisphere and a planisphere . It is easy to remember, because, being respectively a half sphere and a planar projection, it is the only two who do not be spheres!

Pedantry not limit disciplinary note that other -spheres are not very spherical, either: our planet, lumpy potato-shaped wave, is a spheroid . In mathematics, the solid ball is a ball , and sphere is only the surface. Il n’y a malheureusement pas de mot pour désigner les coquilles sphériques telles l’atmosphère, qui sont à la boule et la sphère ce qu’en géométrie du plan la couronne est au disque et au cercle .