Top: rain 雨 (View out of a window 冂 with a cloud 一 from which it is raining =,=), bottom: plow 辰 (At the field corner 厂 a first line 一 is plowed by the farmer 农 [农 = Chinese for farmer])
Mnemonic
When rain makes "plowed lines" (in a puddle), it is like a "quake".
Actually 7 - 9 a.m., and above it assigned to the zodiac sign: Dragon. Here pragmatically understood as "plow". At the field corner 厂 a first line 一 is plowed by the farmer 农 [农= Chinese for farmer].
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