New Moon - The Moon is between Earth and the sun, so the side we see is dark (in other words, it's invisible to the eye).
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Earth's atmosphere bends and filters sunlight as it passes around the edges of the world. The shorter blue wavelengths scatter, while red and orange light continue onward and reach the moon. The result resembles the warm glow of sunrise and sunset. In effect, light filtered through Earth's atmosphere tints the lunar surface.