noun
gnomonic projection; central projection
Technical term in cartography; a map projection where great circles appear as straight lines.
心射図法では、大圏航路が直線で表される。
In the gnomonic projection, great-circle routes are represented as straight lines.
Compound of 心 (center), 射 (projection), and 図法 (projection method). The exact historical derivation is uncertain; the term is conventionally used in cartography.