Why are there seven days in a week?

The Babylonians’ calendar was passed down from civilization to civilization.

By: Kristin Heineman, Colorado State University, The Conversation

Outlets: The Conversation

Published: March 15, 2026

Words: 785

Last Updated: 3 months, 3 weeks ago

By Kristin Heineman, Colorado State University

Curious Kids is a series for children of all ages. If you have a question you’d like an expert to answer, send it to CuriousKidsUS@theconversation.com.

Why are there seven days in a week? – Henry E., age 8, Somerville, Massachusetts

Waiting for the weekend can often seem unbearable, a whole six days between Saturdays. Having seven days in a week has been the case for …

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