There's a bit of variance for imaging and the sector cordinates I use. (I cheat and have a master sector overlay)
So measure the sectors around Sol. They are 20 x 20 ly. And hopefully around 1cm = 20 ly.
But just use the sector boxes as your guide.
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SIRSIG
AKA: SirPostalot
AKA: The MapMaker
AKA: The Trek Cartographer
AKA:...Well I could keep going forever