Issue 19 of The Classroom Astronomer magazine

Features: Universal Healthcare for Satellites: Diagnosing the Health of Artificial Moons - Doctor, doctor! Something's gone wrong with my satellite! Can you look at it and tell me what's gone bad? From my backyard? Cover Story! Seeing the Invisible, Near and Far, Infrared Astronomy in the Classroom - We actually see so little with our eyes. What happens if we widen our window in the electromagnetic spectrum? Here are terrestrial and celestial results. Maximizing Star Party Telescope Experiences - It is important to everything go right, from the sky down to the eyepiece, for a good star party experience. Here’s some tips for preparing your telescope, and for your evening. AstroStats 3: How Different are these Groups of Planets? - What’s the probability your stars are the same as mine? We test hypotheses using Excel. Astrolabes for the Modern Audience - A do-it-yourself astrolabe can do more than a soda-straw and protractor for measuring the sky. It also connects astronomy, mathematics and history. Columns: Astronomy of the Northern Sky - Out to the Galaxy's Rim - Time to shatter the celestial sphere and move outwards from the Sun to the edge of the Milky Way. What can we detect in Northern Skies of other galactic spiral features? Astronomical Teachniques - New and improved Atomic Hotel 2.0, complete with colored photons!; A website where you can write your course name in extragalactic space. My View of the Classroom Universe -(Editorial) - Fragmentary Thoughts and Teachers' Spring Planning Sky Calendar

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