Good Morning is a greeting, a greeting, a gesture of politeness and civility employed in people's first meeting after the moment they wake up in the morning.
Good morning is an expression used to greet people all morning, until noon.
The "good morning" greeting in addition to being a greeting means the wish that the other person has a peaceful day.
After midday, the greeting changes to "good afternoon", which is used until evening. "Good night" is the last greeting of the day, used after 6 pm at night.
There are journalism programs on Brazilian television networks whose names refer to the new day that is being born, for example, Good morning PE, Good morning São Paulo, Good morning Rio Grande, Good morning Brazil etc ...
In Brasilia, a program called "Bom dia Ministro" is presented on television, which interviews Ministers of the Brazilian government, to address matters relating to their portfolio.