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.
On June 21, 2018, at around 21:00 UTC, the sun moves out of Taurus the Bull and into Gemini the Twins. Note that we’re talking about the boundaries of astronomical constellations – not astrological “signs” – of the zodiac.