First, lets start off with a new canvas. Press CTRL+N to create a new canvas with the following specifications:
Click to View

Now, lets fill the background color with a nice shade of blue ( #184fa2 ) Create a new layer with CTRL+Shift+N and grab your Eliptical Marquee Tool ( M ) and hold shift. Draw a circle of decent size to fill up the canvas while still holding shift. This will ensure that the circle is completely round. Press D to reset the background colors to black and white and then fill the selection with black. ( ALT + Backspace )



Select your Move Tool ( V ) and press CTRL+A to select all of the canvas and use your layer positioning tools to transform the circle to the dead center of the canvas. Click on both of these buttons to center the black circle horizontally and vertically. Press CTRL+D to deselect your selection. Your circle should be looking similar to mine: