The naming of days in a week is a tradition that dates back thousands of years and has been influenced by various cultures, religions, and astronomical observations. Each day of the week has its own significance and meaning, often rooted in mythology, celestial bodies, and cultural beliefs. Here's a breakdown of why all days are named in the calendar week and what they mean:

1. **Sunday:**
  Sunday is named after the Sun, which has been worshipped as a deity in many ancient civilizations. In Christianity, Sunday is considered the Sabbath, a day of rest and worship, as it commemorates the day of the resurrection of Jesus Christ.

2. **Monday:**
  Monday is derived from the Old English word "Monandæg," meaning "Moon's day." It is named after the Moon, which has been associated with various goddesses in mythology, such as Selene in Greek mythology and Luna in Roman mythology.

3. **Tuesday:**
  Tuesday is named after the Norse god Tyr (Tiw in Old English), who was associated with war and justice. In Latin, Tuesday is called "Dies Martis," meaning "Day of Mars," after the Roman god of war.

4. **Wednesday:**
  Wednesday is derived from the Old English word "Wodnesdæg," meaning "Woden's day." It is named after the Norse god Odin (Woden in Old English), the chief deity in Norse mythology.

5. **Thursday:**
  Thursday is named after the Norse god Thor, the god of thunder and lightning. In Latin, Thursday is called "Dies Iovis," meaning "Day of Jupiter," after the Roman god Jupiter, who was associated with thunder.

6. **Friday:**
  Friday is derived from the Old English word "Frīgedæg," meaning "Frigg's day." It is named after the Norse goddess Frigg, the wife of Odin and the goddess of marriage and fertility.

7. **Saturday:**
  Saturday is named after the Roman god Saturn, the god of agriculture and time. It was originally called "Saturni dies" in Latin, meaning "Day of Saturn."

These names have persisted over centuries and have been adopted by various cultures and languages, although some variations exist in different regions. They provide a cultural and historical connection to the past and serve as a way to organize time in a meaningful manner. Additionally, the symbolism associated with each day has influenced cultural practices, superstitions, and religious observances. Overall, the naming of days in the week adds richness and depth to our understanding of time and its significance in human culture.

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