Is a day without sunshine, NIGHT????

No. A day is defined as a single rotation of a planet with respect to the sun. Therefore, a day is a day, whether it is dark or light.

Is a day without sunshine, NIGHT????performing art center

Not really and the day the sun stops shinning you will know it as we all freeze to death in a matter of minutes as the heater that supplies almost all our warmth is gone .

Is a day without sunshine, NIGHT????theatre tickets opera theater

Nahhh....... a day without sunshine means you didn't have your Minute Maid Orange Juice ! lol !

Back in mid-seventies, Anita Bryant was the spokesperson for Minute Maid. Her brilliant tag-line was: "A day without Minute Maid orange juice is like a day without sunshine!" She said it day AND night !

She publically slammed the gay lifestyle with such a vengeance that she became standard fodder for nightclub comics. This commercial made me laugh so hard that I dropped my juice glass on the carpet.
No, it could be rainy/cloudy.
Not necessarily. You can have a cloudy day.