Enabling guides to help center in Inkscape

Question

I'm starting to learn to use Inkscape, and I'm going through this tutorial on creating a shiny clockface.

Each hour position is represented by a circle, so I want to place the circle's rotation cross mark is the absolute center of the circle, as well as put the circle at one of the 12/3/6/9 o'clock positions, as in this picture:

I can't figure out how to enable guides (the blue horizontal and vertical lines in the pic) to help me center and snap everything into the correct place, though.

Any ideas? (I'm using the latest version of Inkscape on Mac OS X.)

Answer 1

Guide Lines may be what you need. A horizontal guide can be dragged from the middle of the horizontal ruler onto the drawing field. Similarly a vertical guide from the middle of the vertical ruler.