[header] How to draw a moon in adobe illustrator [title] Create a new document. [step] Go to file] new (or ctrl + n) and set the size of the document to a horizontal letter-sized canvas. Add guides by creating a rectangle using the rectangle tool (w:11 in, h:8.5 in). 
Next, drag the guides onto each center of the bounding box. Finish by right clicking over your ruler to change your document measurements to pixels.