Where does “半正矢” come from?

半正矢 (Japanese) comes from Japanese 半, from Middle Chinese 半.

半正矢 (Japanese): haversine; haversed sine

Definitions

  1. haversine; haversed sine

Ancestry of “半正矢”, step by step

半正矢 traces back through two separate lines of ancestry.

via Japanese 半

StepLanguageWordMeaning
1Japanese半odd; half, semi-; Antonyms
2Middle Chinese半—

via Japanese 正矢

StepLanguageWordMeaning
1Japanese正矢versine; versed sine
Every word from Middle Chinese 半 →Every word from Japanese 半 →