diurnal motion

American  

noun

Astronomy.

1. the apparent daily motion, caused by the earth's rotation, of celestial bodies across the sky.

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diurnal motion British  

noun

1. motion that occurs during the day or daily, such as the diurnal rotation of the celestial sphere

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Example Sentences

The uniform speed of the diurnal motion is 15� per hour.

From Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 7 "Arundel, Thomas" to "Athens" by Various

The stile is made parallel with the earth's axis, and may be considered as coinciding with the axis of the sun's apparent diurnal motion.

From The New Gresham Encyclopedia Volume 4, Part 1: Deposition to Eberswalde by Various

The diurnal motion is compensated by motion about the polar axis only, the other being clamped.

From Pioneers of Science by Lodge, Oliver, Sir

By revolving on this axis it follows a star in its diurnal motion, so that the star is kept in the field of view notwithstanding that motion.

From Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 7 "Arundel, Thomas" to "Athens" by Various

And would there then be a diurnal motion of that Primum Mobile which is so great and beyond them all immense and profound?

From On the magnet, magnetick bodies also, and on the great magnet the earth a new physiology, demonstrated by many arguments & experiments by Gilbert, William