As seen on Astronomy Picture of the Day at the moment of full moon rising over this harbor in Brittany (western France) TWAN photographer managed to capture the strongly colored green flash, an interesting atmospheric phenomenon. Green flashes for both Sun and Moon are caused by atmospheric refraction enhanced by long, low, sight lines and strong atmospheric temperature gradients often favored by a sea horizon. This image is the first frame of a time-lapse video that shows the rising Moon and the gently rocking boats near La Perdrix lighthouse. Laurent Laveder/Pixheaven.net

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