(Undated) -- A rare phenomenon is gracing the night sky this month. Mercury, Venus, Mars, Jupiter and Saturn will be aligned in order starting Friday. This hasn't happened since 2004. Stargazers will need a clear view of the eastern horizon to spot the five-planet alignment. The magazine Sky & Telescope reported that Mercury will grow easier to see with the naked eye throughout June. The best time to see this rarity is about 30 minutes before sunrise.