Wikipedia:Reference desk/Archives/Mathematics/2015 March 25

= March 25 =

Identify map projection in NASA eclipse atlas
Can anyone tell
 * 1) What map projection is used in this image (original at http://eclipse.gsfc.nasa.gov/SEatlas/SEatlas.html ), and
 * 2) What the latitude of the top edge of the map is?

Cheers! cm&#610;&#671;ee&#9094;&#964;a&#671;&#954; 13:35, 25 March 2015 (UTC)


 * It looks like a Miller projection, and the mapping from y pixel coordinate to latitude is $$\varphi = \frac{5}{4}\tan^{-1}\sinh \, 0.002956 \, (682 - y)$$, putting the top and bottom at about ±85°. -- BenRG (talk) 18:31, 25 March 2015 (UTC)