The Historical <a href="https://en.wikipedia.org/wiki/Transit_of_Mercury" class="extiw" title="en:Transit of Mercury">Transit</a> of <a href="https://en.wikipedia.org/wiki/Mercury_(planet)" class="extiw" title="en:Mercury (planet)">Mercury</a> on November 8, 2006. Please note that <a href="https://en.wikipedia.org/wiki/Sunspot" class="extiw" title="en:Sunspot">sunspot</a> #923, which is just below the equator at the left-hand side, is much bigger than Mercury is. You could also see two more sunspots at the right-hand side at the  equator. You could see Mercury as a small black dot in the lower middle of the solar disk. <a href="https://en.wikipedia.org/wiki/Limb_darkening" class="extiw" title="w:Limb darkening">Limb darkening</a> is clearly seen at the image. The picture was taken with a white filter and prime focus. The grainyness in the Sun is called <a href="https://en.wikipedia.org/wiki/Granule_(solar_physics)" class="extiw" title="w:Granule (solar physics)">granulation</a>.
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