This is the 3625th most frequent Japanese word.
陽
"陽" (you) means "sun," "yang" (in yin-yang), or "positive/male principle" in English.
In this sentence, '陽' refers to sunlight or the sun, indicating a bright day.
今日は陽がとても明るいです。
Today, the sun is very bright.
Here, '陽' is used metaphorically in the word '陽気' to describe a person's sunny or cheerful disposition.
彼は陽気な人です。
He is a cheerful person.
In this sentence, '陽' again refers to the sun, used poetically to describe the sunrise.