a calendar window.
The dates used by Emacs for holidays are based on @emph{current
-practice}, not historical fact. Historically, for instance, the start
-of daylight savings time and even its existence have varied from year to
-year, but present United States law mandates that daylight savings time
-begins on the second Sunday in March. When the daylight savings rules
-are set up for the United States, Emacs always uses the present
-definition, even though it is wrong for some prior years.
+practice}, not historical fact. For example Veteran's Day began in
+1919, but is shown in earlier years.
@node Sunrise/Sunset
@section Times of Sunrise and Sunset