Mercury at greatest elongation west
2013 Mar 31
Mercury will reach its furthest point west of the Sun in the morning sky, so that it will rise more than an hour ahead of the Sun, appearing prominent at mag -1.8 on the eastern horizon for a brief time before sunrise. At the moment of greatest elongation, Mercury will lie in the constellation Aquarius, at a distance of 27°49′ from the Sun. Its declination will be -08°03’27” , and so it will be visible across much of the world; it will be possible to see it at latitudes between 61°N and 78°S.