DLR Logo
  Home|Textversion|Imprint   Deutsch
  You are here: Home:International Year of Astronomy - IYA2009
Artikel versenden
Why does a week have seven days?
Even though it would be perfectly possible to imagine a week having five, six or even eleven days, most cultures in the world have seven-day weeks. The reason for this is that seven celestial bodies were known to the ancients: the Sun, the Moon, Mars, Mercury, Jupiter, Venus and Saturn. These celestial bodies are visible to the human eye and people in ancient times were able to observe how they moved across the sky. This is also where the term 'planet' comes from - it is derived from a Greek word meaning 'wanderer'.
Send article link to:


Your e-mail address:


Your message:

Captcha
Captcha
Please enter code:
 
Any details you supply are not stored. You will receive no unsolicited e-mails as a result.
Back Send
Last update: 13/01/2009 14:21:34