When Rose is talking to Mr. Andrews, if you look above at the glass dome, it is sunny and there are blue skies. The ship sank at night and the glass dome is suppose to be see through...because it is made of glass so you should have seen dark and stars.
The dome was created with special internal lights to make it always look like the sun was shining through.The Titanic DID sink at night but this lighting is why it looks like its sunny outside.
Later on in the film, when the ship is sinking, and the water smashes through the dome, you can clearly see the lights flickering and going out in the dome.
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