The atmosphere is scattering the light. When the moon is near the horizon, the moonlight must pass through much more atmosphere than when the moon is directly overhead. By the time the moonlight reaches your eyes, the blue, green, and purple pieces of visible light have been scattered away by air molecules.
Smoke and pollution can make it do it too even when it's overhead. It might be all the BBQ's
Just bodged a big pair of binoculars and a little camera together and managed to get a couple successful photos.
Was a balancing act though, using a reclining garden chair and slotting the camera lens into the eye hole of the binoculars! Then finding the damn moon and focusing the shot!
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