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@gzotti @Hans Thanks so much for the quick replies. In truth, the problem arose due to the limit in calculations with doubles (and floats) of the Mega2560 card. Running the sketch (naturally adapted) on PC with CodeBlocks, the sidereal time is accurate and reliable. But with the same code loaded on the Mega, I have an unacceptable delay of about two minutes. I will certainly study the alternative illustrated by Hans, although I would have preferred to have Arduino manage everything. Alternatively...

Hi everyone! I have implemented an arduino code to control the motorization of a telescope, through the LX200 protocol. Among the specifications of this protocol I read that the transmission of the sidereal time is also provided, in these terms: ": GS # Get the Sidereal Time. Returns: HH: MM: SS #. The Sidereal Time as an ASCII Sexidecimal value in 24 hour format ". The question: Does Stellarium transmit sidereal time to the telescope with the code :GS#, or does it just send right ascension and declination?...