On Nature of Time and Abhidhamma Concept of ‘Moment’ (Khana)

Conceptual time in our mind has such qualities as authoritative and regular flow, where each unit of time is (artificially made) equal to the same unit of time in the future or in the past. The duration of a second is always the same, there can not be two seconds with different durations. For our daily life this idea sounds obvious and automatically accepted as a basic quality of time itself. But this is so only because the object on which this particular kind of time is based assumed to have certain stable characteristics: the rotation of the Earth and the Sun is assumed to be stable, regular and monotonous