The length of day and night throughout a year would match a location at thirty degrees latitude on the Earth.

Angle of incidence of the sunlight makes difference in seasons on Earth as well as in the length of day and night.

In (7) it is arguably the equality in length of the day and night in some day (rather than the day itself).

The weight gains, achieved largely by increasing food intake, are triggered by changes in the length of the day and night.

What about those who cherish animals and plants, since many species regulate their lives by the length of day and night?

Another innovative feature was the ability to re-program the length of day and night in order to account for their changes throughout the year.

Photoperiodism is the physiological reaction of organisms to the length of day or night.

One phenomenon, however, did not fail to make its due impression upon the men; this was the diminution in the length of day and night.

She predicted eclipses, computed the length of day and night and assembled refraction tables.

It was possible to reset the length of day and night in order to account for the changing lengths of day and night throughout the year.