Why do the Moon and Sun Never Appear Together?
Long, long ago, the Sun and the Moon lived happily together in the sky. They always appeared together during the day and night. (Orientation).
One day, the Sun shone brightly so that it almost burned the Moon. The sunlight hurt the Moon’s eyes very  much. This made the Moon blind. (Complication).
The Moon left the Sun although the Sun had apologized to the Moon. (Resulition)
The Sun loved the Moon very much, so he chased her. He chased and chased through the years and centuries but has never caught the Moon. (Complication)
That’s why the Sun shines during the day and at night the Moon appears. They will never reunite again. (Resulition)