SUNSET: 
Get Ready for May 9th's Transit of Mercury
It doesn't happen often, but soon you'll be able to "spot the spot" — Mercury's silhouette — as the innermost planet crosses the Sun's disk.
It doesn't happen often, but soon you'll be able to "spot the spot" — Mercury's silhouette — as the innermost planet crosses the Sun's disk.
By: Patricia Totten Espenak April 14, 2016
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