Where is it? Celestial coordinates explained

What's the difference between RA/DEC and Alt/Az? Why use both? In this video I will explain what a coordinate system is, and why we often use both an equatorial coordinate system (RA/DEC) and a horizontal coordinate system (Alt/Az) in amateur astronomy. This is part of a series called Five Minute Fridays where I will be explaining one concept in under five minutes each week. #fiveminutefridays #nebulaphotos

Book recommendation-- Longitude by Dava Sobel: https://amzn.to/3itld5o

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Creative Commons Media:
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Celestial Sphere by ChristianReady, CC BY-SA 4.0, via Wikimedia Commons
Ra and Dec on celestial sphere by Tfr000 CC BY-SA 3.0 via Wikimedia Commons
Ra and dec demo by Tfr000, CC BY-SA 3.0, via Wikimedia Commons