youdao

Those in the dark are in no position to light the way for others.; Persons in the dark cannot light the way for others.

以其昏昏， 使人昭昭是不行的。

《新英汉大辞典》

A directional light doesn't have a position, only a direction.

定向光没有位置，只有方向。

youdao

Viewed from a distance of ten light-years, the sun's side-to-side wobble due to Jupiter causes its position to change by 1.6 thousandths of an arcsecond.

ECONOMIST: A roadmap for planet-hunting

Parts of inexplicable circles, drawn or incised on the light-colored wall behind him, give an air of happenstance to his position.

NEWYORKER: Art

Feature photography: Javier Manzano, a free-lance photographer, for his extraordinary picture distributed by Agence France-Presse of two Syrian rebel soldiers tensely guarding their position as beams of light stream through bullet holes in a nearby metal wall.

WSJ: 2013 Pulitzer winners in journalism and arts