Our binocular tour of Luna continues; at five days "old" the retreating Terminator has now revealed Mare Serenitatis, the Sea of Serenity crowned at its north-eastern border by the walled plain Posidonus (at three o'clock). Slightly further south the Sea of Tranquility is nearly exposed to the long Lunar day.
At the halfway mark of the Terminator we can see a series of remarkable crater and walled plain formations--formed by the impact of asteroids and other solar system debris. Note how the Terminator itself dimples into the darkness just above crater Theophilus--imagine the rugged terrain where dawn would rise many hours ahead of the regular line of daylight!
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