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].
Image of a hand 一 forearm 丨 and pulse 丶. It was originally also the distance of one inch (Length: 1 SUN = 3.03 cm) from the hand's palm to the pulse. This also stood for a small amount. In the mnemonic, it is used as "skillful hand" and partly also "to measure".
Tip: Go to the radicals that are contained in this character and learn all the characters with this radical systematically!
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