List of Reki Yoko (Japanese Only)

Brief History

• The first issue of Reki Yoko was the one for the year 1955 published in the official gazette on June 1st, 1954.
  • Since 1963, Reki Yoko has been moved to the first official gazette in February, as of today.
  • Since calendar publishing from Ise Shrine became difficult because of the directive "SCAPIN-448" by GHQ in December, 1945, Tokyo Astronomical Observatory has begun publishing "Calendar and Ephemeris" and distributing its abridged version at Mitaka. The latter one turned into Reki Yoko in 1954. The starting date of distribution became July 1st, and then since 1949, moved to June 1st.
• From Shouwa to Heisei
  • On February 1st, 1989, Reki Yoko 1990 was announced without "National Holiday". The "National Holiday" was separately announced on February 28th.
  • At that time, the era name "Heisei" was already fixed by the cabinet order #1, but the emperor's birthday as a national holiday was not yet determined until the revision of the Act on National Holidays on February 17th.
  • February 1st issue was for those who needed calendrical information, specifically the equinox days were available via 24 Solar Terms. While February 28th issue was for those who needed the definitive information on "National Holiday". This decision came from Dr. Yoshihide Kozai, the then director of NAOJ.
• From Heisei to Reiwa
  • Reki Yoko 2019
    • 2018-02-01: Extra comments were inserted. We use "Heisei 31" as this year's era name throughout this edition of Reki Yoko. You may need to refer latest information if necessary. National holidays are based on the currently enacted laws including ones not yet enforced.
    • 2018-12-14: Exclusively for Web Version, more comments were inserted. Because of the Act No. 99 of 2018, the Emperor's enthronement day and its ceremony day, in other words, May 1st and October 22nd become holidays. This law regards these holidays as National Holidays and applies the article 3 clause 2 and 3 of the Act on National Holidays so that April 30th and May 2nd also become holidays.
    • 2019-04-01: Exclusively for Web Version, we changed "Heisei 31" to "Heisei 31 / Reiwa 1" and removed extra comments.
  • Reki Yoko 2020
    • 2019-02-01: Extra comments were inserted. We use "Heisei 32" as this year's era name throughout this edition of Reki Yoko. You may need to refer latest information if necessary. National holidays are based on the currently enacted laws including ones not yet enforced.
    • 2019-04-01: Exclusively for Web Version, we changed "Heisei 32" to "Reiwa 2" and removed extra comments.
• Postponement of Tokyo 2020 Olympic Paralympic Games
  • 2020-02-03: Usual announcement of Reki Yoko 2021.
  • 2020-12-04: Exclusively for Web Version, we revised National Holidays and inserted extra comments. With the Act No. 68 of 2020, exclusively in 2021, the date of "Umi no Hi" becomes July 22nd which is the day before the opening ceremony of the Tokyo Olympic Games, the date of "Sports no Hi" becomes July 23rd which is the day of the opening ceremony, and the date of "Yama no Hi" becomes August 8th which is the day of the closing ceremony. Since August 8th is Sunday, the next day August 9th also becomes a holiday.
  • 2020-12-28: Posted an article "About National Holidays in 2021" in the official gazette under the name of Cabinet Secretariat, Cabinet Office, and NAOJ.
• This list also contains calendars before 1955.

Appendix

• Please be aware that the file size of Reki Yoko before Heisei 12 (2000) is large.
• You need Adobe Acrobat Reader to read these documents. Latest version is recommended.
• Latitude and longitude of cities in Reki Yoko
• History of National Holidays in Reki Yoko
• Old terms on solar and lunar eclipse
• Calendars from Edo Era