volving in a circle whereof the centre lies at the true Pole. The brighter the star the brighter is the trail which it produces, so that the circle made by Polaris is much more conspicuous than the circles produced by the other stars of inferior lustre.

Fig. 8.—The Photograph of the Stars in their Diurnal Motion round the Pole.

It is, however, to be noted that some of the faint stars lie much closer to the Pole than Polaris itself. There is, indeed, one very minute object so close to the Pole that the circle in which its movements are performed seems very little more than a point when