Calendars Through the Ages
Explore the fascinating history of the human endeavor to organize our lives in accordance with the sun and stars.  Learn about astronomical origins and various calendars in this exhibit from the WebExhibits online museum, an multidisciplinary approach to learning.

Holidays on the Net
Your Source for Holiday Celebrations on the World Wide Web.  This is a US-based business that provides historical information on holidays, along with links to further reading and holiday-related items for purchase.

Revised Common Lectionary
The RCL website lists recommended daily biblical readings and prayerful reflections.  It was created and is maintained by the Vanderbilt Divinity Library.

Catholic Church Calendar Page
Created by a lay Catholic faithful, this site lists daily liturgical readings, rosaries, and details of liturgical symbols, based on the standard guidelines of the Catholic Church calendar.