+@node Mayan Calendar
+@subsection Converting from the Mayan Calendar
+@cindex Mayan calendar
+
+ Here are the commands to select dates based on the Mayan calendar:
+
+@table @kbd
+@item g m l
+Move to a date specified by the long count calendar
+(@code{calendar-mayan-goto-long-count-date}).
+@item g m n t
+Move to the next occurrence of a place in the
+tzolkin calendar (@code{calendar-mayan-next-tzolkin-date}).
+@item g m p t
+Move to the previous occurrence of a place in the
+tzolkin calendar (@code{calendar-mayan-previous-tzolkin-date}).
+@item g m n h
+Move to the next occurrence of a place in the
+haab calendar (@code{calendar-mayan-next-haab-date}).
+@item g m p h
+Move to the previous occurrence of a place in the
+haab calendar (@code{calendar-mayan-previous-haab-date}).
+@item g m n c
+Move to the next occurrence of a place in the
+calendar round (@code{calendar-mayan-next-calendar-round-date}).
+@item g m p c
+Move to the previous occurrence of a place in the
+calendar round (@code{calendar-mayan-previous-calendar-round-date}).
+@end table
+
+@cindex Mayan long count
+ To understand these commands, you need to understand the Mayan calendars.
+The @dfn{long count} is a counting of days with these units:
+
+@display
+1 kin = 1 day@ @ @ 1 uinal = 20 kin@ @ @ 1 tun = 18 uinal
+1 katun = 20 tun@ @ @ 1 baktun = 20 katun
+@end display
+
+@kindex g m @r{(Calendar mode)}
+@findex calendar-mayan-goto-long-count-date
+@noindent
+Thus, the long count date 12.16.11.16.6 means 12 baktun, 16 katun, 11
+tun, 16 uinal, and 6 kin. The Emacs calendar can handle Mayan long
+count dates as early as 7.17.18.13.3, but no earlier. When you use the
+@kbd{g m l} command, type the Mayan long count date with the baktun,
+katun, tun, uinal, and kin separated by periods.
+
+@findex calendar-mayan-previous-tzolkin-date
+@findex calendar-mayan-next-tzolkin-date
+@cindex Mayan tzolkin calendar
+ The Mayan tzolkin calendar is a cycle of 260 days formed by a pair of
+independent cycles of 13 and 20 days. Since this cycle repeats
+endlessly, Emacs provides commands to move backward and forward to the
+previous or next point in the cycle. Type @kbd{g m p t} to go to the
+previous tzolkin date; Emacs asks you for a tzolkin date and moves point
+to the previous occurrence of that date. Similarly, type @kbd{g m n t}
+to go to the next occurrence of a tzolkin date.
+
+@findex calendar-mayan-previous-haab-date
+@findex calendar-mayan-next-haab-date
+@cindex Mayan haab calendar
+ The Mayan haab calendar is a cycle of 365 days arranged as 18 months
+of 20 days each, followed by a 5-day monthless period. Like the tzolkin
+cycle, this cycle repeats endlessly, and there are commands to move
+backward and forward to the previous or next point in the cycle. Type
+@kbd{g m p h} to go to the previous haab date; Emacs asks you for a haab
+date and moves point to the previous occurrence of that date.
+Similarly, type @kbd{g m n h} to go to the next occurrence of a haab
+date.
+
+@c This is omitted because it is too long for smallbook format.
+@c @findex calendar-mayan-previous-calendar-round-date
+@findex calendar-mayan-next-calendar-round-date
+@cindex Mayan calendar round
+ The Maya also used the combination of the tzolkin date and the haab
+date. This combination is a cycle of about 52 years called a
+@emph{calendar round}. If you type @kbd{g m p c}, Emacs asks you for
+both a haab and a tzolkin date and then moves point to the previous
+occurrence of that combination. Use @kbd{g m n c} to move point to the
+next occurrence of a combination. These commands signal an error if the
+haab/tzolkin date combination you have typed is impossible.
+
+ Emacs uses strict completion
+@iftex
+(@pxref{Completion Exit,,, emacs, the Emacs Manual})
+@end iftex
+@ifnottex
+(@pxref{Completion Exit})
+@end ifnottex
+whenever it asks you to type a Mayan name, so you don't have to worry
+about spelling.
+