Abstract: A celestial compass includes first and second wheels bearing like astrological reference data in the form of the Zodiac. First and second sets of data to be evaluated as to astrological significance are placed on the first and second wheels respectively. The wheels are of small and relatively large diameters so that when secured to one another at a common center in a manner such that the like reference data are aligned and the first and second sets of data are exposed to view, an empty band is observed on the second wheel just beyond the periphery of the first. A transparent dial bearing degree of arc markings and major and minor planetary aspect symbols in a band corresponding to the exposed band is provided for rotation about the common center. The dial organizes the sets of data for providing a basis for astrological predictions.