A star-filled sky is as mysterious as it is sublime. What are we looking at? How far away and from when?! How do I tell the Little Dipper from the Big Dipper? Is that Cassiopeia or Orion? Is the moon waxing or waning? Whether you're an occasional backyard stargazer or wouldbe astrophysicist, you'll find pages of useful information in the Observer's Notebook: Astronomy . Stunning fourcolour images from the Hubble and ESA space telescopes are interweaved with ruled pages for your own celestial observations, notes and star-based wishes.