[tz] Clarification on LMT entries

[Matt Johnson]

Quick question.  The entry for Europe/Kiev has two solar mean time entries:

Zone Europe/Kiev 2:02:04 - LMT 1880
                 2:02:04 - KMT 1924 May 2 # Kiev Mean Time

While I know how to read this, I'm not sure why the abbreviation KMT exists.  Is this another invented abbreviation, or is there a source?

Also, why 1880 on the LMT line? What is special about 1880?

Thanks,
Matt
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