Look to the eastern horizon an hour after midnight on Aug. 16 to see the half-lit lunar disk — which hits its third quarter phase at 1:12 a.m. EDT (0512 GMT) — roughly 5 degrees to the upper right of the famous Pleiades star cluster. A day later, on Aug.17, the moon will be sitting about 5 degrees to the lower left of the Pleiades. Remember: the width of your three middle fingers held at arm's length measures roughly 5 degrees in the night sky.
The Pleiades, also called the 'Seven Sisters', appears as a faint milky smudge of light to the naked eye and may be a little challenging to spot in the moon-lit sky. If you're having trouble finding it, try the averted vision technique, looking slightly to the side of the cluster so it falls in your peripheral vision, which can make it stand out more clearly.
Source: www.space.com
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