Thursday, April 9, 2015

Tonight's Sky for April 9: Mercury at Superior Conjunction

Today, the planet Mercury has reached superior conjunction. What does that mean? In layman's terms, Mercury will be directly opposite the Sun as seen from Earth in a Mercury, Sun, Earth alignment. End result: the planet will be at its worst point for viewing. Unfortunately, unlike inferior conjunctions wherein a planet moves directly between the Sun and Earth, superior conjunctions result in longer periods of invisibility (though in the case of Mercury, not that long).  

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