Looking for a sky event this week? Check out our full Sky This Week column.  June 20: Libra’s Ghost Cluster The summer solstice occurs at 4:25 A.M. EDT. This is the time the Sun reaches its northernmost point in the Northern Hemisphere sky, which also means our star takes its longest path across this hemisphere’s sky on Continue reading "The Sky Today on Sunday, June 21: A summertime lineup" The post The Sky Today on Sunday, June 21: A summertime lineup appeared first on Astronomy Magazine .