Change description of altzone to not refer to the "0th meridian".
diff --git a/Doc/lib/libtime.tex b/Doc/lib/libtime.tex
index 07fc177..ee31392 100644
--- a/Doc/lib/libtime.tex
+++ b/Doc/lib/libtime.tex
@@ -111,8 +111,8 @@
\begin{datadesc}{altzone}
The offset of the local DST timezone, in seconds west of UTC, if one
-is defined. Negative if the local DST timezone is east of the 0th
-meridian (as in Western Europe, including the UK). Only use this if
+is defined. This is negative if the local DST timezone is east of UTC
+(as in Western Europe, including the UK). Only use this if
\code{daylight} is nonzero.
\end{datadesc}