411 REFERENCE · Wiktionary
Hanke-Henry Permanent Calendar
Reference material by Wiktionary contributors. This retains its source identity and is not 411 news reporting.
English
Proper noun
Hanke-Henry Permanent Calendar
A proposed calendar that maintains synchronization with the solar year by intercalating entire weeks rather than single days, and in which every calendar day always falls on the same day of the week.
See also
en Common-Civil-Calendar-and-Time Calendar its original iteration