Wikipedia:Featured picture candidates/Marine sextant
From Wikipedia, the free encyclopedia
[edit] Marine sextant
- Reason
- This is a revised version of an animation already nominated in WP:FPC. I believe it helps to better understand the basic principle of the instrument and illustrates cleary its use in celestial navigation. The picture file contains a detailed explanation of the numbered frames.
- Articles this image appears in
- Sextant, celestial navigation
- Creator
- Joaquim Alves Gaspar
- Support as nominator — Alvesgaspar 17:36, 7 April 2007 (UTC)
- Comment is there a way to avoid artifact when WikiMedia thumbnails it? gren グレン 18:08, 7 April 2007 (UTC)
- Support per Commons discussion. ~ trialsanderrors 20:08, 7 April 2007 (UTC)
- Support. Shame about the artifacts in the thumbnail but very good quality and useful for the article(s). Diliff | (Talk) (Contribs) 16:38, 8 April 2007 (UTC)
- Support Very informative Jellocube27 21:29, 8 April 2007 (UTC)
- Support Much improved! Just one suggestion, there is actually one last step: 5) read the elevation from the index bar. You might have the measurement "40°" circled briefly. It would make clear the purpose of the device. --Bridgecross 02:38, 9 April 2007 (UTC)
- Support. Perfect! I never knew how to use one of those things, and after just looking at the thumbnail image for a couple loops, it makes sense. — BRIAN0918 • 2007-04-09 13:26Z
- Question: Would you really see the sun as a full circle? Wouldn't it just be a half-circle? — BRIAN0918 • 2007-04-09 13:28Z
- Answer - Yes, a full circle whose size depends on the telescope in use. On the left part of the horizon mirror, which is in fact a transparent glass, the sun's image is dimmer because the reflectivity of the glass is lower. In practise, our eyes seem to melt both images. Alvesgaspar 13:51, 9 April 2007 (UTC)
- Support: Very good picture, but would it be possible to smoothen up the animation? ~Steptrip 15:49, 9 April 2007 (UTC)
- Yes, it is possible but I don't have the time right now. I'll have to go back to the (Corel) drawing board and double the number of frames. - Alvesgaspar 20:54, 9 April 2007 (UTC)
- Info - Brian0918 question made be realize the animation had a mistake: the white boundary line between the glass (left) and the mirror (right) should also rotate. It is fixed now. Alvesgaspar 18:40, 9 April 2007 (UTC)
- Support - Instantly explains the means of operation. — BillC talk 23:16, 9 April 2007 (UTC)
- Support TomStar81 (Talk) 05:08, 10 April 2007 (UTC)
- Weak oppose. Much improved, indeed, but I still don't like the simple "squishing" of the instrument when it is tilted. There really should be some perspective in that part of the animation. --Janke | Talk 06:05, 10 April 2007 (UTC)
- Support as I did on commons ! Blieusong 20:10, 10 April 2007 (UTC)
- Support very useful to understand an instrument everybody knows, but few know how to use. Moravice 16:52, 11 April 2007 (UTC)
- Support clearly explains everything :-D --Penubag 08:28, 13 April 2007 (UTC)penubag
Promoted Image:Using sextant swing.gif --trialsanderrors 04:57, 15 April 2007 (UTC)
