THIS is a sequel to the large “Plane Trigonometry” by the same writer, and is naturally drawn up on the same plan. Its size is handy, and yet it contains a very large amount of matter. Much of this ...

AS Prof. Newcomb has been in close touch with all branches of the astronomy of position during the last forty years, and as so much of the progress that has been made is his work, a text-book by him ...