Wednesday, April 27, 2016

Tonight's Sky for April 27: Mars is 15 Arc Seconds Across

Mars may be over a month away from opposition, the point in its orbit where it is opposite the Sun as seen from Earth and also the point in its orbit where it appears the brightest as seen from Earth, but that doesn't mean that the Red Planet isn't already putting on a show. As of now, Mars appears to be 15 arc seconds across, 3 arc seconds shy of its peak of 18 arc seconds that will occur at opposition. For comparison, thanks to orbital geometry, this is already as big as Mars got in the 2014 opposition, wherein Mars peaked at 15 arc seconds.

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