OBSERVATORY OF VASSAR COLLEGE.
The computations in the following notes are by students of Vassar
College. Although merely approximate, they are sufficiently accurate
to enable the ordinary observer to find the planets.
Scientific American, Vol. XLIII.—No. 1. [New Series.], July 3, 1880 A Weekly Journal of Practical Information, Art, Science, Mechanics, Chemistry, and Manufactures · 第 78 / 157 题