It is night on that part of the earth which is turned away from the sun.
How often do we have the change from day to night?
As often as the earth turns over, which is once in twenty-four hours.
What is a day?
A day is the time from sunrise till sunrise again, from sunset till sunset again, from noon till noon again, or from midnight till midnight again.
What does a day include?
It includes the night-time as well as the day-time, of the twenty-four hours.
When it is day-time on one part of the earth, what is it on the opposite part?
It is night-time on the opposite part.
When it is morning to us, what is it to people living on the opposite side of the earth?