軌き道どう短たん半はん径けい

noun

semi-minor axis (of an orbit)

Technical term used in orbital mechanics and astronomy. Refers to the shorter radius of an elliptical orbit.

• 軌き道どう短たん半はん径けいは、楕だ円えん軌き道どうの短たん軸じくの半はん分ぶんの長ながさを表あらわす。

  The semi-minor axis represents half the length of the minor axis of an elliptical orbit.