Captured one day after the new moon during the Christmas week, the moon was only 2% illuminated by the sunlight. Though, we can clearly distinguish the entire disk due to a phenomenon called Lunar Earthshine. In the foreground, located in a top hill, is a beautiful well-preserved medieval castle from Mértola village, in Dark Sky® Alqueva Reserve, decorated with Christmas lights around the walls and by coincidence very well aligned with the crescent moon, forming the perfect frame for a Christmas Card.
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