NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Robert Bernecky
Date: 2012 Jul 1, 15:13 -0700
Geoffrey explains it well. But in practice we all use UTC, and as you explain UT1 (what NA uses) drifts from UTC. So in that context (when users insist on using the wrong time standard) the NA is "more wrong" without a leap second.
There is no leap second inserted into the NA, but it does need UT1 which does not change in a predictable way, and so the NA must use a "best guess" on how UT1 will change in the following year.
Has anyone seen this? Apparently the leap second did cause problems.
http://www.news.com.au/travel/news/leap-second-crashes-qantas-and-leaves-passengers-stranded/story-e6frfq80-1226413961235
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