Hello, I am doing research and I was told that I need to create an O-C diagram for an eclipsing binary. Unfortunately, I haven't been given too much instruction on how to do this. Right now, all I have are minimum times of light, the period of the system, and cycle numbers. I know that O-C is observed minus calculated, but I am not sure what is observed and what is calculated. All that I do know is that O-C is measured in days. Also, I am not sure what to put on the vertical axis (I saw that some O-C diagrams have JDs). Thanks for your help. I am extremely new at the research process.