Despite having to prepare presentations and create materials for students I have to confess it is only fairly recently that I have taken a real interest in the area of copyright. Despite this in the past I have spent too much time trawling the internet for the best possible image or trying to create my own material which is very time consuming. I am currently writing a course on Celestial Navigation and use of a sextant. Using http://search.creativecommons.org/ link I quickly found two images which could easily be incorporated. The first was an image of a sextant published on Wikimedia Commons and created by Joaquim Alves Gaspar, https://commons.wikimedia.org/wiki/File:Marine_sextant.svg The second was also on Wikimedia Commons and this shows the Celestial Sphere https://commons.wikimedia.org/wiki/File%3ARa_and_dec_on_celestial_sphere.png By Tfr000 (talk) 15:34, 15 June 2012 (UTC) (Own work) [CC BY-SA 3.0 ( https://creativecommons.org/licenses/by-s...