A diagram of the equatorial coordinate system by CMG Lee based on <a href="//commons.wikimedia.org/wiki/File:AstroDeclinationRightascension.png" title="File:AstroDeclinationRightascension.png">File:AstroDeclinationRightascension.png</a>
<a href="//commons.wikimedia.org/wiki/User:Cmglee" title="User:Cmglee">Cmglee</a>
CC BY-SA 4.0
Own work based on: <a href="//commons.wikimedia.org/wiki/File:AstroDeclinationRightascension.png" title="File:AstroDeclinationRightascension.png">AstroDeclinationRightascension.png</a> <i>by</i> <a href="https://de.wikipedia.org/wiki/User:Ulrich.fuchs" class="extiw" title="de:User:Ulrich.fuchs">Ulrich.fuchs</a>  and <a href="//commons.wikimedia.org/wiki/File:AstroDeklinationRektazension-de.jpg" title="File:AstroDeklinationRektazension-de.jpg">AstroDeklinationRektazension-de.jpg</a> <i>by</i> <a href="https://de.wikipedia.org/wiki/User:Ulrich.fuchs" class="extiw" title="de:User:Ulrich.fuchs">Ulrich.fuchs</a>