With the moon block you can add a picture of the current moon phase to your dashboard. Use the following code:

columns[2] = {}
columns[2]['blocks'] = [ 'moon']

If needed you can change the width:

blocks['moon'] = {
  width: 6

We have 100 moon images. A moon cycle takes approximately 28 days. That means that the moon picture will refresh approximately 4 times a day.