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The absolute limit of a telescope resolution is given by diffraction. No matter how perfectly built and aligned is a telescope, you cannot resolve angles smaller than $$\theta \propto \frac{\lambda}{D}$$ where $\lambda$ is the wavelength of interest and $D$ is the diameter of the telescope. This is why a number of millimeters and radio telescope (and also ...


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There is a very nice web-based utility called Staralt that I frequently use before observing runs. This has lots of observatories pre-programmed or you can put in your own latitude and longitude AND altitude (can you do that in Stellarium?). To quote the website - "you can plot altitude against time for a particular night (Staralt), or plot the path of ...



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