wiedzieć - to have knowledge or information about something
znać - to be familiar with something/somebody
Or, if you prefer, Wiedzieć = Savoir, Znać = connaître. Note also "Umieć", to know how to do something.
I just realized my previous comment is wrong... It is the other way around. Sorry
Polish "parasol" can be the one that covers you from rain and the one that covers you from sun, so yeah, it should work. Added.