Hello everyone. I'm finishing up my diploma in Computer Engineering Technology, and it is time to start thinking of final projects. Basically we have to build something that incorporates a microcontroller and we can do pretty much anything we want. I have decided to build an equatorial telescope mount for my reflector telescope, and have it do star tracking as well as a "go to" feature from a database of likely just the Messier objects. I have a few questions that I really need to find some clear answers on before I can decide on what type of stepper motors etc that I will need to buy. Should I do a Pulse Width Modulation motor for a constant speed for tracking or would a stepper motor work? How many degrees per second (or fractions of degrees) does the mount have to move to track stars? This is likely the most important question so I can get to work on finding a drive system for my mount. Also, can anyone point me to some good websites explaining sidreal time? Google has not turned up anything that does a really good job of explaining this to me. I was thinking of just having a real time clock chip on my PCB that I could set to my local sidreal time and just have a simple way to program it if I needed to change sites. I was thinking of just having one of the big dipper stars as HOME and I could set the scope to that star and just press a button to set up my sidreal time. Would this work? Any input is appreciated!