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CSULA Astronomy 1520 Lab 5 USING A STAR FINDER (Also known as "Astrorama" or "Planisphere") WARNING: MAKE SURE TO BUY A PLANISPHERE FOR 30° or 35° NORTH LATUTUDE OBJECTIVE: To learn how to use an Astrorama/Planisphere. These devices display the sky for any hour of any day of the year for an observer at any location on Earth whose latitude is near north 34° (or +34°). [For other latitudes, visit a local bookstore or telescope retailer.] They are portable but less versatile versions of the celestial globes used in Labs 1 and 2. INTRODUCTION: Earlier lab exercises have shown that it is simple to determine the appearance of the sky from any location on Earth as long as you have access to a celestial globe and remember how to find the sidereal time. While the procedure is not difficult, it is not very convenient, since celestial globes are expensive and awkward to carry around. Fortunately, a convenient device, called an Astrorama or Planisphere, is available which does many of the things a celestial globe can do for the particular latitude for which the Astrorama is designed. The Astrorama you have purchased should be designed for