When estimating the brightness of a naked-eye variable, care must be taken to allow for atmospheric dimming. The closer a star is to the horizon, the more of its light will be lost. The following table gives the amount of dimming for various altitudes above the horizon. Above an altitude of 45 degrees, extinction can be neglected for all practical purposes.
Dimming in magnitudes
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Compared to film cameras, digital cameras are easy to use, fun and extremely versatile. Every day there’s more features being designed. Whether you have the cheapest model or a high end model, digital cameras can do an endless number of things. Let’s look at how to get the most out of your digital camera.