To spot the celestial 'smiley face,' skywatchers in the U.S. will need a clear view of the eastern horizon in the hour leading up to sunrise on April 25. Look to the eastern sky a

Before sunrise on April 25, a slender waning crescent moon will appear left of Venus and Saturn to create the tilted happy face.

According to NASA, the planetary phenomenon will be clearest about 45 minutes before sunrise, low in the eastern sky and appearing near the moon. Venus and Saturn will be the easiest to spot — but for those with a clear view of the horizon, Mercury can be observed hanging low and bright in the cosmos.