The absolute basics are covered first, such as what the compass needle does and how to find directions other than north with a compass. The tutorial then moves on to discuss using compasses with maps, covers magnetic declination and for dedicated orienteers, a page on navigating in fog. The author then goes on to recommend some good compasses both for beginners and experts, and of course there is the ubiquitous collection of links. This site, created by an astronomy student in Amsterdam, offers a virtual tour of our Helios. You start in the center and then work your way out through the different layers of the sun all the way to Earth, where the site explains a few of the influences the sun has on the Earth.
Explanations are clear and aided by graphics and movies.
The main page says the tour should take about 20 minutes, but if your internet connection is on the slow side, it will probably take longer. The sky isn't as serene as it looks on a clear night. Cataclysmic variables are close binary star systems composed of a small, massive star called a white dwarf and a larger less massive star called a red dwarf. Close enough that the red dwarf star loses mass to the white dwarf star - and that's where the boom comes in. You don't have to be an astronomy expert to understand the information presented in the guide.