संस्‍कृतशब्‍दकोशः

तिर्यगयन

सूर्य का वार्षिक अयन

annual revolution of the sun

Monier–Williams

तिर्यगयन — {ayana} n. 'horizontal course', the sun's annual revolution (opposed to its diurnal revolution in which it rises and sets vertically), {tairyagayanika}