Left: water 氵, right: writing brush 翰 (At sunrise the person 人 takes the feather 羽 as writing brush) Here: similar to tides: 潮 (Like a lake 湖 with changing directions [once old: 古 and also mirrored] the tides=潮)
Mnemonic
The waters of the tides, where the waves 人 are like feathers 羽: on the ocean.
The sun 日 rises between plants 艹. The very similar radical 莫 stands for sunset. This seems bizarre, can be argued based on the characters for morning 朝 in comparison to evening 暮.
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