日

月

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日（rì）：

1. means sun.
2. 日is also a radical, not all characters with radical “日” are related with sun, but some are, such as “阳”。

月（yuè）：

1. means lunar.
2. 月is also a radical, but not all characters with radical “月” are related with lunar。

日+月=明 （míng）：a word means bright。