Historians often compare different time periods to understand social change.

Many museums have closed periods during renovations, so check the schedule before visiting.

The historian compared artifacts from different periods of time to understand cultural changes.

Many people experience mood swings and cramps before and during their menstrual periods.

On Fridays, a few students choose to enroll in zero periods to get ahead on credits.

In the optics lab, we measured the decay over several semi-periods to determine the damping.

Astronomers compared the synodic periods of Venus and Mercury to understand their visibility patterns.

Scholars debate the exact dates of the Sothic periods in relation to ancient Egyptian calendrical reforms.

Researchers compared the gestation periods of several mammal species to understand reproductive adaptations.

Managers should be cautious after project launches, as honeymoon periods can mask underlying issues.