A 360-Day Year literally means a year that is 5¼ days shorter than today and is a view usually favoured by people with a religious agenda, such as Christadelphians(a). The author of this paper, Dale W. Wong, has expanded his claim into a 2006 book .
Donald W. Patten wrote several books and papers, two of which were with Samuel R. Windsor entitled The Recent Organisation of the Solar System, and The Mars-Earth Wars, which are also available online(h)(i). One of the consequences of this ‘reorganisation’ and encounters with our neighbouring planets was a lengthening of our solar year from 360 to 365+ days(j)!
In the 1950s, Immanuel Velikovsky, often accused of an overdependence on the Old Testament quoted a number of ancient sources to support his view that there was a calendrical change required as a consequence of a close encounter with an extraterrestrial body, which slowed the Earth’s rotation. He claimed that this took place in Egypt after the reign of the Hyksos.
Another unusual claim comes from Yair Davidiy, who wrote on the Brit-Am website – “Dolmens and Megalithic Monuments originated in Ancient Israel. Jeremiah 31:21 says that the Lost Ten Tribes will construct a trail of Megalithic Monuments from Israel to their places of exile and evidence of this path will enable them to return. Such a trail exists! It is the Trail of the Dolmens from the Middle East to the West.”(d) As far as I’m aware Davidiy has not explained the huge numbers of dolmens in places such as Korea and Japan! Professor W.A. Liebenberg has written a longer piece(e) on the ‘Lost Tribes’ as the builders of the megaliths. However, since the megalithic building period is generally accepted to have lasted from around 4000 BC until 1500 BC, this created a problem for Davidy and Liebenberg (D&L). The disappearance of the Lost Tribes is dated to around 700 BC leading to their dispersal and proposed megalith building as they travelled. D & L include Newgrange (3200 BC) among their monuments and that is where their difficulties begin. Like Velikovsky(c), both claim that before 700 BC the year was 360 days in length rather than our present 365 days. They argue that if Newgrange (among other monuments) had been built when we had a 360-day year the sun would not still light up the interior at the winter solstice. Therefore, they conclude that most megaliths were erected after 700 BC!
There is also a website actively concerned with the study of the 360-day year(b). This includes comments on ancient 360-day calendars.
Guy Cramer offers a very detailed review of the 360 vs 365 debate, citing among other sources, the Book of Enoch(f)(g).
(f) 360 vs. 365 (xwalk.ca) (part 1)
(g) Isaiah’s Sundial & Joshua’s Long Day (xwalk.ca) (part 2)