These features are best observed under oblique lighting conditions when the terminator has just moved past the crater during the waxing phase.

Many are qualities that are best observed using stop-action in a film room, where the nuances of the game become clear, he said.

Infrared radiation, also important in the current study, is blocked by water vapor in the air, and therefore is also best observed at high altitude.

These are best observed under conditions of oblique lighting, when the terminator still lies on or near the Mare Fecunditatis.

They are best observed during civil twilight when the sun is between 1 and 6 degrees below the horizon.

Because they are so thin, live Leptospira are best observed by darkfield microscopy.

Some phenomena are best observed (or only!)

Many objects are best observed using higher magnifications, which inevitably go along with narrow fields of view.

As a result, the youngest SSCs are best observed in radio and infrared.

This is especially necessary in stadiums where the subject matter is typically best observed from above, rather than in-line or from below.