Image: Tractatus Georgi Peurbachii super propositiones Ptolemaei de sinubus & chordis.agr

Size of this preview: 524 × 600 pixels. Other resolutions: 210 × 240 pixels | 3,024 × 3,460 pixels.

Original image ‎(3,024 × 3,460 pixels, file size: 6.65 MB, MIME type: image/jpeg)

Description: Close up of a page from Peurbach's trigonometric table on display at the Computer History Museum. From CHM, display label: "Peurbach, Georg and Regiomontanus, Tractatus Georgi Peurbachii super propositiones Ptolemaei de sinubus & chordis, Johann Petreius, Germany, 1468 (1541 edition) Peurbach's may be the oldest surviving printed mathematical tables. Loan of Gwen and Gordon Bell, B333.85" The Sinus values in the table are based on a circle of radius 60 and, taken as a decimal fraction, are 60/100ths of the modern sine function for the angle shown. Thus the value printed in the upper-left corner, .3856796, is equal to 0.6 × sin(40°), rounded to seven decimal places. See w:Ptolemy's table of chords for a description of this practice. The narrow columns give the change in sinus value per arc second, in units and tenths, for interpolation.
Title: Tractatus Georgi Peurbachii super propositiones Ptolemaei de sinubus & chordis.agr
Credit: Own work, work photographed was published in 1541 and is therefore out of copyright
Author: ArnoldReinhold
Usage Terms: Creative Commons Attribution-Share Alike 4.0
License: CC BY-SA 4.0
License Link: https://creativecommons.org/licenses/by-sa/4.0
Attribution Required?: Yes

Image usage

The following page links to this image:

Georg von Peuerbach

All content from Kiddle encyclopedia articles (including the article images and facts) can be freely used under Attribution-ShareAlike license, unless stated otherwise.