揭示大自然的规律
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环天顶弧[Circumzenithal Arc]
¤〖天文〗
2004-10-8 12:55
An
arc
centered on the
zenith
visible when the
Sun
is
above the
horizon
. It is a
rainbow
-like phenomenon caused by ice crystals.
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above the horizon. It is a rainbow-like phenomenon caused by ice crystals. above the horizon. It is a rainbow-like phenomenon caused by ice crystals.
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