* theory.html (Accuracy of the tz database):
Update citation of Morrison, Stephenson et al to their 2020 addendum.
---
 theory.html | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/theory.html b/theory.html
index 458d64ac..e9928e30 100644
--- a/theory.html
+++ b/theory.html
@@ -832,10 +832,10 @@ 
href="https://www.dissentmagazine.org/blog/booked-a-global-history-of-time-vanes
     title="International System of Units">SI</abbr></a> seconds to
     historical <a href="https://en.wikipedia.org/wiki/Solar_time";>solar 
time</a>
     to more than about one-hour accuracy.
-    See: Stephenson FR, Morrison LV, Hohenkerk CY.
-    <a href="https://dx.doi.org/10.1098/rspa.2016.0404";>Measurement of
-    the Earth's rotation: 720 BC to AD 2015</a>.
-    <cite>Proc Royal Soc A</cite>. 2016;472:20160404.
+    See: Morrison LV, Stephenson FR, Hohenkerk CY, Zawilski M.
+    <a href="https://doi.org/10.1098/rspa.2020.0776";>Addendum 2020
+    to 'Measurement of the Earth's rotation: 720 BC to AD 2015'</a>.
+    <cite>Proc Royal Soc A</cite>. 2021;477:20200776.
     Also see: Espenak F. <a
     
href="https://eclipse.gsfc.nasa.gov/SEhelp/uncertainty2004.html";>Uncertainty
     in Delta T (ΔT)</a>.
-- 
2.50.1

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