--- orig/doc/misc/calc.texi
+++ mod/doc/misc/calc.texi
@@ -11103,9 +11103,9 @@
 
 The Julian day number is based on the Julian cycle, which was invented 
 in 1583 by Joseph Justus Scaliger.  Scaliger named it the Julian cycle
-since it is involves the Julian calendar, but some have suggested that
+since it involves the Julian calendar, but some have suggested that
 Scaliger named it in honor of his father, Julius Caesar Scaliger.  The
-Julian cycle is based it on three other cycles: the indiction cycle,
+Julian cycle is based on three other cycles: the indiction cycle,
 the Metonic cycle, and the solar cycle.  The indiction cycle is a 15
 year cycle originally used by the Romans for tax purposes but later
 used to date medieval documents.  The Metonic cycle is a 19 year