title: What does %% mean?
body: <p>From the question you can probably tell that I don't know much about code! My question is this:</p>
  
  <p>What does this code mean?</p>
  
  <pre><code>mnlong &lt;- 280.460 + .9856474 * time
  mnlong &lt;- mnlong %% 360
  mnlong[mnlong &lt; 0] &lt;- mnlong[mnlong &lt; 0] + 360
  </code></pre>
  
  <p>I understand that the <code>mnlong</code> and <code>time</code> are variables but the <code>%%</code> confuses me.</p>
  
  <p>Could someone give me a basic description?</p>