Bruce McClure has served as lead writer for EarthSky's popular Tonight pages since 2004. He's a sundial aficionado, whose love for the heavens has taken him to Lake Titicaca in Bolivia and sailing in the North Atlantic, where he earned his celestial navigation certificate through the School of Ocean Sailing and Navigation. He also writes and hosts public astronomy programs and planetarium programs in and around his home in upstate New York.
By Bruce McClure in | October 23, 2012
The ecliptic hits the horizon at a shallow angle on early spring mornings, which keeps Mercury buried in the glow of morning twilight at northerly latitudes.