Mark Twain used a solar eclipse as a devise to rescue Hank Morgan from
certain death and establish him as the premier wizard of King Arthur's
Court.  He posited the date as the 21st of June, 528 at 12:03 pm.  No
such eclipse occurred so I'm wondering how/where Twain came up with this
date.  Did he invent this or was it erroneously reported in some almanac
that may have been in Twain's possession?