Halley's periodic returns have been subject to scientific investigation since the 16th century.

She continued to act, although infrequently, with the intervals in between her periodic returns growing increasingly long.

The annual cost of submitting the periodic statistical returns is anticipated by Customs to be about £40m.

Comets are typically observed on a periodic return.

There were periodic returns of abbots and relics, often ending in more massacres.

Neither part could be found on their predicted periodic returns in 1859 (in any case an unfavourable return for viewing), 1865, and 1872.

Once embarked on its highly elongated orbit, a comet generally continues to make periodic returns to the inner solar system.

He spent the next 37 years in China with periodic returns to the U.S. on furlough to further his education.

Royalty payments must be paid within 60 days following each date on which you prepare (or are legally required to prepare) your periodic tax returns.

Mr. Eager settled in Florida in the late 60's and raised a family, making periodic returns to the music business.