sunrise
暘 centers on the moment the sun appears above the horizon: sunrise. It captures the specific event of the sun rising, not just general sunlight or daytime.
暘 combines 日 (sun) with 昜, which likely contributes the sound and carries a sense of rising or expanding. The character specifically denotes the sun rising.
The sun 日 rises beside 昜, a shape that suggests spreading light upward. Picture the sun climbing over the horizon, marking the start of a new day.
For ヨウ, imagine the sun rising and you yawning as you wake: yawn -> ヨウ, and the sunrise greets you.
—