Play all audios:
Access through your institution Buy or subscribe 50 YEARS AGO A brief review of the history of the calendar by Y. G. Perel suggests the urgent desirability of establishing a world calendar,
such as was proposed by India in 1953 before the United Nations. According to this proposal, the year will be divided into four quarters of thirteen weeks each, with the first month of
thirty-one days and the following two of thirty days each. An additional day (the day of peace and friendship) is added after December 30, and on leap years an additional day after June 30.
This is a preview of subscription content, access via your institution ACCESS OPTIONS Access through your institution Subscribe to this journal Receive 51 print issues and online access
$199.00 per year only $3.90 per issue Learn more Buy this article * Purchase on SpringerLink * Instant access to full article PDF Buy now Prices may be subject to local taxes which are
calculated during checkout ADDITIONAL ACCESS OPTIONS: * Log in * Learn about institutional subscriptions * Read our FAQs * Contact customer support RIGHTS AND PERMISSIONS Reprints and
permissions ABOUT THIS ARTICLE CITE THIS ARTICLE 50 & 100 years ago. _Nature_ 457, 972 (2009). https://doi.org/10.1038/457972a Download citation * Published: 18 February 2009 * Issue
Date: 19 February 2009 * DOI: https://doi.org/10.1038/457972a SHARE THIS ARTICLE Anyone you share the following link with will be able to read this content: Get shareable link Sorry, a
shareable link is not currently available for this article. Copy to clipboard Provided by the Springer Nature SharedIt content-sharing initiative