title: What is the approximate resolution of a single precision floating point number when its around zero
body: <p>I am storing many longitudes and latitudes as <code>doubles</code>, I am wondering if I can get away with storing them as <code>floats</code>.</p>
  
  <p>To answer this question, I need to know the approximate resolution of a <a href="http://en.wikipedia.org/wiki/Single_precision_floating-point_format" rel="noreferrer">single precision floating point number</a> when the stored values are longitudes / latitudes (-180 to +180).</p>