What does the joke "Good morning, Father Sun" mean?

Analysis, if this is a joke, if it is not foreign, if this joke is complete, then there must be something ridiculous about it.

Maybe this joke is true in life. If it is regarded as an interesting thing in life, it is really funny, but if it is told as a joke, it is not a joke worth laughing at.

Let's make a concrete guess. First of all, people will try to vent when they are upset. You're kidding. The way you vent must be the key. Xiaoming repeatedly told his father that "the sun is early". Although he was too lazy to go to work, he told his teacher at school, which showed that there was something wrong with the teacher. The sun is the sky, and the sky refers to the modern Cao.

Maybe this joke is not complete.