system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How do we know the exact position of our solar system in the Milky Way?

I have always been amazed by this pictures portraying our location in the Universe. I know that this pictures are representations but, how the scientists know in fact that we are located in that exact place in the Galaxy?
gpt
Imagine you live in NY. You can know your distance to Chicago, to Washington and to Tulsa, and you know the distsnce from all those cities to the other ones. You can draw a triangle knowing three of these distances, so you can draw a map of all the cities (I am 'supposing' here a flat Earth, to simplify).  
So science knows (different methods here, including radiation and light measurements) the distance between the Earth on the other 'rocks' in our Galaxy. Is it also known that the Galaxy (and 'Galaxy' is just the portion out there we know) is somehow flat, so you can draw/portray those kind of pics you referred to.