Definition #1. “An uninterrupted interval of time”

Under definition #1, a “moment” is defined not by its length but by its uninterrupted nature

Once a “Definition #1” moment is interrupted or ended by any means, resumption even of the same activity constitutes a separate period of time — a separate moment — and not a continuation of the first moment.

The Definition #1 kind of “moment” can be years, decades, or even centuries long: “At this moment in history, China is the most populous country in the world but India may soon hold that title.”

Definition #2. “A very brief period of time”

For definition #2, P5 of the Trust Test employs one second, the briefest universally familiar time unit (see #1508) that accommodates the multi-exposure behaviors of hundreds of millions of devices.

As per P5, all combined exposures in a TTG photograph must begin within the same single second.

Note that a single-exposure, undoctored photograph remains the gold standard for viewers and the reference point for TTG.

That’s why P4 and P5 of the Trust Test are written to ensure that even when multiple exposures are combined, the result will look like a single-exposure, undoctored photograph.

For more on “moment”-related issues, see the FAQ on P5