Mercury square Uranus

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Hello,

I've read that this placement is common in geniuses.
I have this placement, a square, but it's not a 90° degrees, is at 80°.
Does it change if the degrees aren't at 90°? Or it has to be a perfect square?

Hail Satan!

88

 

[rook75ten]

Does it say it's a square on the chart?if it does then yea, aspects don't have to be exact, they allow for orbs,
Quote from astro.com"There is also a certain amount of “play”, which means that an aspect is said to “work” or be operative within a few degrees either way of being exact. This margin of “play” is defined by the orbs. "

on astro it says the max orb on a square is 10° for the default settings,so at 80° you're reaching the maximum orb distance but it's still a square based on the information on the site. 
http://www.astro.com/astrology/in_aspect_e.htm

 

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Thank you very much
It helps me a lot, I'll study more about it