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In our video where we explained in detail and practically the connection and programming of Astronomical time clocks that can calculate sunrise and sunset using real time and geographical coordinates and open and close their contacts accordingly; we also talked about their differences from mechanical (classical) time clocks, their advantages and disadvantages, places of use, types and models. Thanks to this lesson, you can learn the coil ends, contacts and connection of the time relay, as well as the adjustment of the relay according to different parameters such as sunrise-set, days of the week, hours, minutes and seconds. You can find answers to the questions of How to adjust the position of the Astronomical Time Clock? How to choose a city? How to determine the coordinate? How to program? How to connect? What is the connection diagram? Don't forget to leave a comment for your questions and suggestions...