This limited the application of rekido to a few tasks, such as the writing of rekichu (various information recorded in the almanac), the making of shichiyoreki (calendar of the seven luminaries) and chuseireki (chusei calendar), and the prediction of solar eclipses.
そのため、暦道は毎年の暦注の記入と暦の頒布（具注暦）、七曜暦・中星暦の作成や日食の予測に限定された。