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what point the Star is upon: Example, obſerving the Stars in the Great Dog's hind part, above the Horizon, and having no compaſs, I refer to my watch, and find it 3 in the morning of the 15th of October, then rectify the Planisphere to the day and hour, and we find the Star in the Dog's flank, South-Eaſt by South, and that in the tail a quarter Eaſt; Aldebaran is on the Meridian, and the large Star in the Lion's tail, just riſing on the Eaſt-North-Eaſt; thus, the points are gained by the Planisphere, without any other inſtrument, not only by land, but on the ſea, between London and Holland, or in the Iriſh ſea, or the Weſtern Ocean to Newfoundland, or any other part, in or near this parallel, with uſeful and pleaſing effects both to the landſman and mariner.
Problem 24. To find when the Sun riſes or ſets coſmically with any Star, ſuppoſe the Great Dog, Sirius. Bring the center of the Star to the eaſtern Horizon; lay the director through the interſection of the Horizon and the Ecliptic, and it points out the 11th of Auguſt for the day required; but to know when they ſet coſmically, or together, bring the Star to the weſtern Horizon, and the director through the interſection of the Ecliptic and the weſtern Horizon, and it points out the 15th of May to be the day ſought.
Problem 25. To find when the Sun riſes or ſets achronically, ſuppose with the right ſhoulder of Orion. Bring the Star to the weſtern Horizon, and lay the di--
