The weekly line generally refers to 5 days. Gann theory is a unique analysis method and market measurement theory based on the comprehensive application of mathematics, geometry, religion and astronomy. It was put forward by Willian D Gann, the most famous investment master in the 20th century, combining his outstanding achievements and valuable experience in the stock and futures markets.

Gann thinks that the more important cycle is:

Short-term circulation: 1 hour, 2 hours, 4 hours, ... 18 hours, 24 hours, 3 weeks, 7 weeks, 13 weeks, 3 months, 7 months;

Mid-term cycle: 1 year, 2 years, 3 years, 5 years, 7 years, 10 year, 13 year, 15 year;

Long-term period: 20 years, 30 years, 45 years, 49 years, 60 years, 82 or 84 years, 90 years, 100 years.