There were two reasons for this emergency appointment: the first was that the then tenmongon no hakuji (master of astronomy), WAKE Hisakuni (? 和気久邦), was in Iyo Province, and the second was that the two people who received imperial decrees of tenmon misso were not sufficiently skilled.
これは当時の天文権博士和気久邦が伊予国に滞在中であり、天文密奏宣旨を受けた2名も技術が未熟であったために応急措置として与えられたものである。