It takes a special mind to figure out they need to "solve" nighttime.

That said, I wonder if you could use it to screw with people. Would it also have military applications? What if you could light up the area you were about to attack and then come at them out of the dark. Also useful against vampires. Once you start thinking about it, the applications are endless.

It's going to take quite a while for your solar panel to produce the amount of energy it took to launch that mirror up there. This is like tearing down a rainforest to make room for a wind turbine.

What a nice startup scam. But let’s assume this piece of shit is actually built. A single space grain will shatter that mirror into the sparkliest of catastrophes in human history. I can finally look up at the night sky and say unironically “Those aren’t stars…”

Can I use it to annoy my neighbor?

What a horrible, horrible idea. Dear God no.

It's like opposite of the Simpson episode where Mr Burns blocks the sun to have the city use their lights at daytime.

The earth can’t even currently remove as much heat as it needs to during our current night cycles, we do not need to be speeding it up and cooking it from multiple angles.

This will totally screw up the wildlife in the area :(

The USSR (then Russia) did this in the 90s, first prototype was a 20m wide reflector. Second prototype failed and then interest and money went away. Originally it was meant to also test solar sails feasibility.

If you have Nebula, Mustard did a 10mn documentary on it.

Project Znamya on Wikipedia

I made this comment in another thread about this, but this would be an amazing way to screw with someone on a camping trip. Fifteen minutes of daylight would be just enough for someone to get up, get dressed, start going about their morning routine, only for the sun to go out.

Bonus points if they don't check their watch and notice it's 2am.

Why? Because they can. Has zero practical applications

What with global warming, we'll more likely need satellites to block light from hitting earth during the day than to reflect even more to it at night!