north or south of its next neighbor.

Next to the bottom of the chart I find the parallel of 20 deg., and I see that every five degrees is indicated by the figures at the sides.

By the eye, or with the aid of a ruler, I easily estimate where the horizontal line of 23 deg.

would fall, and since 20 min.

is the third of a degree I perceive that it is, for the rough purpose of merely finding a conspicuous planet, negligible, although it, too, can be included in the estimate, if thought desirable.
Having already found the vertical line on which Jupiter is placed and having now found the horizontal line also, I have simply to regard their crossing point, which will be the situation of the planet among the stars.