Since the sky rotates (or appears to) around the north celestial pole, the mount also has to be aligned to this axis of rotation to track the stars’ movement.Įquatorial mounts are designed to be polar aligned – if you don’t bother, you might as well have saved your money and bought a cheaper altazimuth mount. The sky, in fact, only appears to rotate it’s actually the Earth that’s rotating, once every 24 hours.īut since we’re observing from the surface of the spinning Earth, it looks like the night sky is rotating around us. It’s a notional spot where our planet’s axis of rotation meets the celestial sphere – an imaginary ball with the Earth at its centre, onto whose inner surface all the stars are projected. The north celestial pole is the point that the sky rotates around. To do this properly, the equatorial mount has to be ‘polar aligned’ its right ascension (RA) or polar axis needs to be lined up so that it points at the north celestial pole.
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Now we’re going to explain how to make the mount follow, or track, stars and other objects as they move with the night sky. Then do the RA axis: with the counterweight shaft horizontal, loosen the lock and adjust the counterweights until the scope stays put when you let go. axis lock loose, slide the tube back and forth in the rings until the scope rests flat.
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