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This Polaris Right Ascension DC Motor Drive for Meade's Polaris series equatorial mount adds continuous RA tracking to the manual mount so you don't need to manipulate the RA slow motion cable which can cause unwanted vibrations. With the motor drive attached and turned on, the telescope can move at the sidereal rate to track any celestial object and keep it centered in your field of view. With the variable speed adjustment, you can quickly and easily change the speed to track the moon, planets, or sun as well as deep sky objects like galaxies and nebulae. The motor drive will keep the object in your field of view for 10 to 20 minutes before re-centering is required on a well polar-aligned mount. The motor runs for approximately 40 hours on a single included, and readily available, 9V battery. The drive is compatible with operation in either Northern or Southern hemispheres, and can be switched between the two simply by selecting the proper hemisphere on the N/S switch on the motor's front panel. It easily installs directly to the mount in under five minutes.