astronomical day

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

A vigorous effort was made during the last fifteen years of the 19th century to bring the two uses into harmony by beginning the astronomical day at midnight.

From Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 10 "David, St" to "Demidov" by Various

A diurnal flower closes at night; a diurnal motion is precisely coincident with the astronomical day.

From The Century Vocabulary Builder by Bachelor, Joseph M. (Joseph Morris)

Your correspondent DX. is mistaken in supposing that "foreigners ordinarily commence the astronomical day at midnight."

From Notes and Queries, Vol. IV, Number 105, November 1, 1851 A Medium of Inter-communication for Literary Men, Artists, Antiquaries, Genealogists, etc. by Various

One of the objects of the third resolution is to make the new universal day coincide with the civil day rather than with the astronomical day.

From International Conference Held at Washington for the Purpose of Fixing a Prime Meridian and a Universal Day. October, 1884. Protocols of the Proceedings by Various

Since the civil day begins 12 hours before the astronomical day and ends 12 hours before it, A.M. of a new civil day is P.M. of the astronomical day preceding.

From Lectures in Navigation by Draper, Ernest Gallaudet