Features: Star Guide: This map provide astronomy enthusiasts a clear guide to learn about constellation, brights star,. Polishing your star gazing skills with this essential tool. Easy to Use: Simply aligns the date and time, and this rotating star guide will show you overhead. It's user friendly and great for advanced astronomers and beginner alike. Great Telescopic Option: Whether you're using a telescope, binoculars, this star guide is a excellent accessory for your astronomical observations. Designing for use within 30 degree to 50 degree northern ranges, it can be used regardless of the calendar year. Enjoy unhindered star gazing all year rounds. Educational Tool: The star guide displays the locations of 100 star clusters, and galaxies. It's the good aid for observing these body through a telescope or binoculars. Specifications: Component:Cardboards Size:Approx.22x22cm/8.66x8.66inch Item Type: Star Guide Map Package Includes: 1pcs Rotating Star Guide Map note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you donot mind befores you order. 2.Due to the differences between different monitors, the picture may not reflect the actual coloring of the item. Thanks for your understandings.