"Indian month names" developed in American Farmers' Almanacs in the early 20th century. Some of the Farmers' Almanacs''' "Indian month names" are in fact derived from continental tradition. The Old English month names fell out of use entirely, being revived only in a fictional context in the Shire calendar constructed by J. R. R. Tolkien for use in his The Lord of the Rings. Icelandic calendar A special case is the Icelandic calendar developed in the 10th century which, inspired by the Julian calendar, introduced a purely solar reckoning with a year having a fixed number of weeks (52 weeks or 364 days). This necessitated the introduction of "leap weeks" instead of Julian leap days. The old Icelandic calendar is not in official use anymore, but some Icelandic holidays and annual feasts are still calculated from it. It has 12 months, of 30 days broken down into two groups of six often termed "winter months" and "summer months". The calendar is peculiar in that each month always start on the same day of week. This was achieved by having 4 epagomenal days to bring the number of days up to 364 and then adding a sumarauki week in the middle of summer of some years. This was eventually done so as to ensure that the "summer season" begins on the Thursday between 9 and 15 April in the Julian calendar. Hence always starts on a Friday sometime between 8 and 15 January of the Julian calendar, always starts on a Sunday between 7 and 14 February of the Julian calendar. ("Short days") (mid October – mid November, "slaughter month" or "Gór's month") (mid November – mid December, "Yule month") (mid December – mid January, "fat sucking month") (mid January – mid February, "frozen snow month") (mid February – mid March, "Góa's month") (mid March – mid April, "lone" or "single month") ("Nightless days") (mid April – mid May) Harpa is a female name, probably a forgotten goddess. The first day of Harpa is celebrated as '', the First Day of Summer (mid May – mid June, another forgotten goddess) (mid June – mid July, "sun month") (mid July – mid August, "hay business month") (mid August – mid September, "two" or "second month") (mid September – mid October, "autumn month") Many of the months have also been used in Scandinavia, the Norwegian linguist Ivar Aasen wrote down the following months