Strictly positive numbers, Z0+, don't include zero. Positive numbers aka naturals, Z+ = N, do.Edit: this is what I've learned at school, but according to wikipedia the definitions of these vary quite a bit
That feels wrong though. First of all the prime meridian is completely arbitrary (as opposed to the equator), and in some parts of the world like Japan and New Zealand the "western" hemisphere would actually be closest towards the east.
the Local Group, which is the name for the local group of galaxiessounds like they spent a lot of time coming up with that namejokes aside, thanks for the interesting info!
oh so what's next? are your physics gonna tell us that the earth isn't flat either?