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Rika-Nenpyo: A Century of Scientific Chronicle

On November 28, 2025, Maruzen Publishing Co., Ltd. will release the latest edition of the Rika-Nenpyo, a comprehensive science data book celebrating its 100th anniversary. This special milestone comes with a series of events and initiatives aimed at engaging the scientific community and the general public alike. From lectures and campaigns to the digitization of all back issues, the celebrations promise to shine a light on the rich history and relevance of this celebrated publication.

A Legacy of Knowledge

First published in 1925 by the National Astronomical Observatory of Japan, the Rika-Nenpyo has established itself as a unique and indispensable resource for scientific knowledge. Over the past century, it has published 99 editions with only a few interruptions. The structure of the book includes seven main sections: calendar, astronomy, meteorology, physics/chemistry, geology, biology, and environment, along with various appendices. Despite the addition of new sections—biology in 1984 and environment in 2005—the book’s foundational style remains largely unchanged since its inception.

The Rika-Nenpyo is not just a book; it's a chronicle of scientific progress. Each edition reflects new discoveries and corrections of past understandings, allowing readers to appreciate the evolution of scientific knowledge over the decades. This compilation serves as a critical reference for educators, researchers, students, journalists, and science enthusiasts alike, making it an essential tool for learning and research.

100th Anniversary Events and Initiatives

Commemorative Lecture: A Walk Through 100 Years of Science

The highlight of the anniversary celebrations is a special lecture scheduled for December 14th at Hitotsubashi Auditorium in Chiyoda, Tokyo. Esteemed speakers, including Professor Takaaki Kajita, a Nobel laureate in Physics, will discuss the advancements in various scientific fields highlighted in the Rika-Nenpyo. Attendees can expect to gain insights into current research trends and the future of science based on the last 100 years of knowledge.

Exciting Giveaway Campaign

In honor of its centennial, Maruzen is also launching a campaign where customers who purchase the Rika-Nenpyo from participating bookstores will receive two special anniversary gifts: a retro-style book cover inspired by the Taisho era and a convenient square magnet featuring the 2026 edition’s design. This is a limited-time offer available while supplies last.

Call for Senryu Poems

To commemorate the anniversary, a Senryu poem contest invites the public to share their experiences with the Rika-Nenpyo, whether through learning, research, or personal reflections. Selected poems will receive recognition and prizes, fostering a sense of community among science enthusiasts.

Comprehensive Digitization of Past Issues

In addition to these events, the milestone will see the complete digitization of all 99 editions of the Rika-Nenpyo. These e-books will be made available across various digital library services and online bookstores starting December, ensuring that the rich scientific heritage is preserved and accessible.

The 2026 Edition of Rika-Nenpyo

The latest version, Rika-Nenpyo 2026, is a testament to a century of scientific discovery, comprising 1,224 pages of updated knowledge and statistical data. Priced at ¥1,650 (including tax), this edition will be available in both A6 and A5 formats, catering to different reader preferences. As with every edition, it is expected to be a crucial reference for students and researchers alike.

Conclusion

The Rika-Nenpyo continues to be a cornerstone resource in understanding and appreciating science. As it celebrates its hundred-year journey, it remains committed to updating and expanding its content, ensuring knowledge for future generations. Congratulations to Maruzen Publishing on this landmark occasion!

For more information on the anniversary events and to participate in the campaigns, please visit the official Rika-Nenpyo website.