Talk:Bessel ellipsoid

Where is the source
This page contains this statement: "The Bessel ellipsoid fits especially well to the geoid curvature of Europe and Eurasia." Where can I find source for this statement? Is there any comparison between Bessel and other ellipsoids (IUGG, WGS etc.)? Péter ✎ 11:36, 15 November 2008 (UTC)

EPSG:7004
There are currently a few issues with this article that are highlighted by EPSG:7004 If anyone has time to integrate this information into the article, please do. If not, then I'll get to this when time permits (it never does). + m t  00:44, 13 May 2021 (UTC)
 * The "Bessel 1841" ellipsoid is defined to be exactly $a$ = $6,377,397.155 m$, 1/$f$ = $299.153$. The current articles does not state these numbers, but shows unsourced values.
 * OGP's remarks are revealing:
 * The secondary reference for this US Army Map Service Technical Manual; 1943. I can't easily find this source, but this would be a good reference to have.
 * The primary source is . Look at the last page for $a$ and $b$. It also has $log a$ and $log b$ values too.