[tz] Earth's day lengthens by two milliseconds a century

[Paul Eggert]

Thanks, I added the attached patch.
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From 30aa1d0662d5dce12ffb52ff3d066b4406139664 Mon Sep 17 00:00:00 2001
From: Paul Eggert <eggert at cs.ucla.edu>
Date: Thu, 8 Dec 2016 14:37:11 -0800
Subject: [PATCH] =?UTF-8?q?Refer=20to=20Espenak=E2=80=99s=20Uncertainty=20?=
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* Theory: Cite Espenak.  (Thanks to Pierpaolo Bernardi.)
---
 Theory | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/Theory b/Theory
index 7f836ee..22164f4 100644
--- a/Theory
+++ b/Theory
@@ -364,6 +364,8 @@ Errors in the tz database arise from many sources:
    Measurement of the Earth's rotation: 720 BC to AD 2015.
    Proc Royal Soc A. 2016 Dec 7;472:20160404.
    http://dx.doi.org/10.1098/rspa.2016.0404
+   Also see: Espenak F. Uncertainty in Delta T (ΔT).
+   http://eclipse.gsfc.nasa.gov/SEhelp/uncertainty2004.html
 
  * The relationship between POSIX time (that is, UTC but ignoring leap
    seconds) and UTC is not agreed upon after 1972.  Although the POSIX
-- 
2.7.4