Physics and Astronomy Labs/Celestial sphere

/Sandbox 1/ /Sandbox 2/  /Sandbox 3/
 * If you use a sandbox, post it on the board to avoid edit conflicts.

Wikimedia links

 * Celestial coordinate system
 * Horizontal_coordinate_system
 * Ecliptic coordinate system
 * Cartesian coordinate system
 * Polar coordinate system
 * Curvilinear_coordinates (confusing!)

Top external links on Google

 * 1) Celestial sphere is #1 on Google today
 * 2) http://csep10.phys.utk.edu/astr161/lect/celestial/celestial.html
 * 3) http://www.astro.cornell.edu/academics/courses/astro201/cel_sphere.htm
 * 4) http://stars.astro.illinois.edu/celsph.html Great pictures
 * 5) http://pvs.kcc.hawaii.edu/ike/hookele/celestial_sphere.html
 * 6) http://astro.wsu.edu/worthey/astro/html/lec-celestial-sph.html
 * 7) https://www.youtube.com/watch?v=1Toya19H12w 2'46 '' time duration
 * 8) https://en.wikibooks.org/wiki/General_Astronomy/The_Celestial_Sphere Wikibooks is a sister to Wikipedia and Wikiversity
 * 9) http://astro.unl.edu/naap/motion2/animations/ce_hc.html UNL hosts the best astronomy lab materials I know about.

Gallery (commons)
These images on Wikimedia Commons are subject to minimal copyright restrictions.

Gallery notes: