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4 million km in diameter the photosphere is, relatively speaking, thinner than the skin of an apple. Nevertheless, it is what Earth based astronomers see and it contains the famous “rice-grain” granulation visible even in good amateur images. This granulation is the result of supersonic gas convection “bubbles”, roughly 1,500 km across, bursting and cooling at the visible surface. The lines between the granules are where the cooling material sinks back down. The photosphere is not a surface in the same sense as the Earth’s surface.

From space. At a sunset eclipse it departs into space after totality. Another factor to consider at such extreme cases is the extreme velocity of the shadow ground track at early morning, late evening eclipses. The speed of the umbral shadow through space will not vary all that much between lunar perigee and apogee. qxd 7/4/07 12:02 PM Page 36 Fig. 5. As the umbra leaves the Earth’s surface the umbral shadow is stretched out into a highly elongated ellipse as it glances the surface at a shallow angle.

This is called a libration in longitude. There is an additional effect called diurnal libration, caused by the fact that the Earth has a radius of over 6,000 km and so, depending on whether the Moon is rising or setting (or if you are at the north or south poles for that matter) you are standing on a platform which gives you an extra ability to peer round the limb. However, most observers will view an eclipse when it is near their meridian. qxd 7/4/07 12:03 PM Page 40 ecliptic/ecliptic pole. Thus, as the Moon orbits the Earth, first one pole and then the other tilts by 6°41′ towards the Earth (the absolute extreme librations are actually 6°50′).

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ACTUALTESTS Oracle 1Z0-031 Exam Q and A 05 30 05


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