On December 9, 1872, an imperial edict was issued to change the prevailing lunar calendar to the solar calendar, and the organization was significantly damaged by that, though later it was given a monopoly to publish the official calendar for ten years, starting in 1873.
明治5年11月9日(旧暦)に太陽暦改暦の詔が出され、頒暦商社は大きな損害を受けたが、代わりに明治6年から10年間の官暦出版の独占権を認められた。