astronomical day

Example Sentences

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On the other hand, those navigators who were in the neighborhood of the 180th meridian would have all their work of one day occurring in the same 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

The civil day always commences at the midnight preceding this astronomical day.

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

To find at any hour desired what star will cross your meridian, take the R.A. of the Mean Sun for Greenwich Mean Noon of the proper astronomical day.

From Lectures in Navigation by Draper, Ernest Gallaudet

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)

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