Can we launch a crewed spaceship to the sun if we go at night?

Yes, but if you go at night, you'd be headed in the wrong direction and have to make a loop around the other side of the universe.

You must have polish blood in you sorry just so you learn something the sun is always on we are just pointed away at night 

You would need a very good reason to go there

For a start you would need Pi times the Energy to send The craft from Earth at an Orbital Velocity of 66. 000 mph Zero where your destination will be

So that means a lot of fuel

And that alone would not be a good idea to bring close to the Sun at a Temperature of 6,000 degrees C

High risk of Explosion in space which would not be a nice way to die

 You would also need extra fuel to avoid being sucked into the Sun by its Enourmous Gravity

Tip, bring Sausages for the Barbeque !!

It would also be the most expensive Space mission in History

With all the protection the Craft and Crew would require

For a return Trip not as much Energy would be needed

Even Solar Power could do it

But that all depends wether the Mission would be Survivable or not

Probably not seeing others have failed

But NASA have been tight lipped about about them all

Yes, this is so funny. You see, at night Sun isn't burning, so it'll be like a trip to the Moon.

Please explain what makes displaying your foolishness for all to see so appealing to you?  A question like this is the reason Y!A is shutting down.

Well, two things... 

First, YES, you can launch a crewed spaceship to the Sun, and you can leave day *or* night....  They'll all die in transit, but... it's possible. 

Second, the reason they'd die is because it takes so long to get there.   Earth orbits the Sun (I'm hoping you knew that), and our orbital speed is quite fast - about 66,600 mph.  To get to the Sun, you'd need to *lose* almost all that speed;  Recently, we sent the Parker Solar Probe to analyze the Sun, and it had to do a series of Venus fly-bys, using the planet to slow it's speed.  It took several months of these maneuvers to position the craft, and still is using Venus for maneuvering  (And, it wasn't going *to* the Sun, but just in orbit about it...). 

So... we *can*, but... it likely won't be the successful mission you're hoping for....

Or if we went in the winter.

Yes we can.

It should be a spectacular sight when it vaporizes.

yes, you can launch a spaceship to the sun.

just try it and see and then you'll know