Some clock-shift problems could be avoided by adjusting clocks continuously or at least more graduallyfor example, Willett at first suggested weekly 20-minute transitionsbut this would add complexity and has never been implemented.
Willett's first suggestion was to change clocks by 20 minutes how often?
weekly

The Second Sino-Japanese War had seen tensions rise between Imperial Japan and the United States; events such as the Panay incident and the Nanking Massacre turned American public opinion against Japan. With the occupation of French Indochina in the years of 194041, and with the continuing war in China, the United States placed embargoes on Japan of strategic materials such as scrap metal and oil, which were vitally needed for the war effort. The Japanese were faced with the option of either withdrawing from China and losing face or seizing and securing new sources of raw materials in the resource-rich, European-controlled colonies of South East Asiaspecifically British Malaya and the Dutch East Indies (modern-day Indonesia). In 1940, Imperial Japan signed the Tripartite Pact with Nazi Germany and Fascist Italy.
What did the United States place on Japans war efforts?
embargoes

With Yoritomo firmly established, the bakufu system that would govern Japan for the next seven centuries was in place. He appointed military governors, or daimyos, to rule over the provinces, and stewards, or jito to supervise public and private estates. Yoritomo then turned his attention to the elimination of the powerful Fujiwara family, which sheltered his rebellious brother Yoshitsune. Three years later, he was appointed shogun in Kyoto. One year before his death in 1199, Yoritomo expelled the teenage emperor Go-Toba from the throne. Two of Go-Toba's sons succeeded him, but they would also be removed by Yoritomo's successors to the shogunate.
What was the name of the emperor that Yoritomo removed from the throne?
Go-Toba