Diurnal motion

Diurnal motion
Diurnal motion is an astronomical term referring to the apparent daily motion of stars around the Earth, or more precisely around the two celestial poles.

Diurnal motion The daily motion of the sky produced by rotation of the Earth, causing the rising and setting of the Sun, Moon, planets and stars.

Diurnal motion is an astronomy term referring to the apparent daily motion of stars around the Earth, or more precisely around the two celestial poles....

Diurnal Motion
(a) The apparent westward motion of celestial bodies, as seen from Earth, due to the Earth's axial rotation.
(b) The apparent daily motion of celestial bodies across the sky from east to west, caused by the Earth's rotation.

Diurnal motion at different latitudes
Actually, all objects are slowly changing their relative positions on the celestial sphere, but for most the motion is so slow that it cannot be detected over timespans comparable to a human lifetime; ...

Diurnal motion
The apparent motion of the sky from East to West caused by the Earth moving from West to East.
Earthshine ...

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106. Diurnal Motion
The apparent daily rotation of the sky.
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107. Doppler Broadening
The smearing of spectral lines because of the motion of atoms in the gas.

A disk also refers to the apparent circular shape of the Sun and the Moon, or of a planet when viewed through a telescope.

diurnal motion
The apparent daily motion of the objects of the solar system against the background stars.

Relation of the Diurnal Motion to Spherical Co-ordinates
The vertical line at any place being the fundamental axis of the apparent system of co-ordinates, this system rotates with the earth, and so seems to us as fixed.

(b) A measure of time that conforms, within a close approximation, to the mean diurnal motion of the Sun and serves as the basis of all civil timekeeping. UT is formally defined by a mathematical formula as a function of sidereal time.

The daily progress of the Sun and the other stars across the sky is known as diurnal motion. As we have just seen, it is a consequence of Earth's rotation.

Nearly every living thing on Earth is affected by celestial cycles, especially the diurnal motion of the Sun, the tides of the moon, and the seasons of the year. So it is unsurprising that our distant ancestors were curious about the sky.

Telescope mounting, equatorial:
One rotatable axis, set parallel to the earth's axis of rotation, compensates for diurnal motion of the heavenly bodies in right ascension. The other axis permits adjustment in declination.

Apparent solar ~: the measure of time based on the diurnal motion of the true sun.

The Sun also moves through the Zodiac, though its apparent motion (diurnal motion) is actually caused by the movement of Earth. It is worth noting here that as a result of precession the constellations have moved over 30º eastwards.

universal time (abbr UT) Time defined by the rotational motion of the earth and determined from the apparent diurnal motions which reflect this rotation; because of variations in the rate of rotation, universal time is not rigorously uniform.

Time defined by the rotational motion of the earth and determined from the apparent diurnal motions which reflect this rotation; because of variations in the rate of rotation, universal time is not rigorously uniform. Also called Greenwich mean time.

See also: Diurnal, Earth, Apparent, Sky, Solar