大たい圏けん図ず

also: だいけんず

Meanings

1

gnomonic chart; great-circle chart; great-circle map

A specialized cartographic term for a chart or map on which great circles appear as straight lines, used in navigation and geodesy.

大たい圏けん図ずは、航こう空くう機きの最さい短たん経けい路ろを計けい画かくするのに使つかわれる。
Great-circle charts are used to plan the shortest routes for aircraft.
航こう海かい士しは大たい圏けん図ずを見みながら針しん路ろを決きめた。
The navigator decided the course while looking at the gnomonic chart.