--- ray/doc/man/man1/gendaymtx.1	2020/09/11 16:53:57	1.14
+++ ray/doc/man/man1/gendaymtx.1	2021/02/17 02:30:08	1.15
@@ -1,4 +1,4 @@
-.\" RCSid $Id: gendaymtx.1,v 1.14 2020/09/11 16:53:57 greg Exp $
+.\" RCSid $Id: gendaymtx.1,v 1.15 2021/02/17 02:30:08 greg Exp $
 .TH GENDAYMTX 1 01/19/13 RADIANCE
 .SH NAME
 gendaymtx - generate an annual Perez sky matrix from a weather tape
@@ -115,7 +115,7 @@ The
 .I \-D
 option may be used to specify an output file to contain a list of
 solar positions and intensities corresponding to time steps in the
-weather tape where the sun has any portion above the horizion.
+weather tape where the sun has any portion above the horizon.
 Sun radiance values may be zero if the direct amount is zero on the input.
 Sun modifiers and names will be indexed by the minute, numbered from
 midnight, January 1st.