近きん点てん引ひき数すう

noun

argument of periapsis

Technical term in astronomy and orbital mechanics; refers to the angle from the ascending node to the periapsis (closest point) of an orbit.

• 人じん工こう衛えい星せいの軌き道どう要よう素その一ひとつとして、近きん点てん引ひき数すうが計けい算さんされる。

  The argument of periapsis is calculated as one of the orbital elements of the satellite.