Chapter 47: 460-465
Contents
Page 461
Bradley's Star Catalogue
See page 173.
Peach Bottom Ferry
Peach Bottom, Pennsylvania is an unincorporated village in Peach Bottom Township, Lancaster County, in the state of Pennsylvania in the United States. It lies on the east bank of the Susquehanna River... The original town of Peach Bottom was located across the river in York County. From WIKI
Page 462
"Trig"
Trigonometry (called "trig" for short) (from Greek trigōnon "triangle" + metron "measure")is a branch of mathematics that deals with triangles, particularly those plane triangles in which one angle has 90 degrees (right triangles). Trigonometry deals with relationships between the sides and the angles of triangles and with the trigonometric functions, which describe those relationships... One of the earliest works on trigonometry by a European mathematician is De Triangulis by the 15th century German mathematician Regiomontanus. Trigonometry was still so little known in 16th century Europe that Nicolaus Copernicus devoted two chapters of De revolutionibus orbium coelestium to explaining its basic concepts. From WIKI
eighteen-inch Hadley's
See page 270.
