title: How can I make a clock tick?
body: <p>I'm making a clock right now and currently my second hand, minute hand, and hour hand are all drawn graphically using a <code>Line</code> object with an <code>(x0, y0)</code> beginning coordinate and <code>(x1, y1)</code> end coordinate.  </p>
  
  <p>What's confusing me right now is how to make the second hand "tick" every time a second passes. That is, how can I update the <code>(x1, y1)</code> coordinate (since the beginning coordinate is always in the center of the clock, we don't need to update it) so that it will move clockwise 6 degrees? This is confusing to me because the direction of the unit circle (and thus the direction of radians) goes counter-clockwise. </p>