The phases of the Moon last approximately seven days, with 4 × 7 = 28 days in a month and also in a female menstrual period. In China 7 determines the stages of female life: a girl gets her “milk teeth” at seven months, loses them at seven years, reaches puberty at 2 × 7 = 14 years, and reaches menopause at 7 × 7 = 49. Shakespeare wrote of the seven ages of man, an idea that goes back much earlier. Tiw was a Norse god of war, parallel to Mars in role but to Zeus in etymology, and Frigg was the Old English version of Frea (or Freya), wife of Woden (= Odin). There are seven days of the week, named after various ancient gods and planets (Sun-day, Moon-day, Tiw’s-day, Woden’s-day, Thor’s-day, Frigg’s-day, Saturn-day). The number 7 is often considered lucky, and it has a definite mystique, perhaps because it is a prime number-that is, it cannot be obtained by multiplying two smaller numbers together. Counting from 1, the eighth note up the scale is the exceedingly harmonious octave, which is how the name arose. Pythagorean interest in the mathematical patterns in music gives 7 a privileged role, for there are seven distinct notes in the musical scale-corresponding roughly to the white notes on a piano. In medieval education, students pursued the trivium (grammar, rhetoric, and logic) and the quadrivium (music, arithmetic, geometry, and astronomy), a total of seven subjects, collectively known as the liberal arts. The sum of the spiritual 3 and the material 4 is 7. SpaceNext50 Britannica presents SpaceNext50, From the race to the Moon to space stewardship, we explore a wide range of subjects that feed our curiosity about space!.Learn about the major environmental problems facing our planet and what can be done about them! Saving Earth Britannica Presents Earth’s To-Do List for the 21st Century.Britannica Beyond We’ve created a new place where questions are at the center of learning.100 Women Britannica celebrates the centennial of the Nineteenth Amendment, highlighting suffragists and history-making politicians.COVID-19 Portal While this global health crisis continues to evolve, it can be useful to look to past pandemics to better understand how to respond today.Student Portal Britannica is the ultimate student resource for key school subjects like history, government, literature, and more.Demystified Videos In Demystified, Britannica has all the answers to your burning questions.This Time in History In these videos, find out what happened this month (or any month!) in history.#WTFact Videos In #WTFact Britannica shares some of the most bizarre facts we can find.Britannica Classics Check out these retro videos from Encyclopedia Britannica’s archives.Britannica Explains In these videos, Britannica explains a variety of topics and answers frequently asked questions.
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