From Earth, big - dish radar can precisely measure the changing tilt of Mercury's
rotation axis as well as what one of the co-authors calls «the planet doing the twist»: tiny changes in its rotation speed due to solar tides.
Not exact matches
Note also that the work translated
as «day» can also be translated
as «age», and does not always refer to a 24 hour period (one
rotation of the earth on it's
axis).
Because of this, the robot can use bearings with far bigger diameter on its
rotation portion
as compared to humans and animals, whose shoulder joints are arranged on different
axes.
That means its orbital period is the same
as its
rotation around its
axis.
EL61,
as it is officially known, is a mass of ice and rock that flops through space with a spin rate far faster than that of any known body its size, making complete
rotations around its wide
axis every four hours.
And,
as one geophysicist writes, «the torques from the sun, moon, and planets move the
rotation axis [of Earth] in space; torques from the atmosphere, ocean, and fluid core move the
rotation axis relative to the crust of Earth.
That motion, over a period of months, would allow researchers to very accurately characterize the wobble in Mars's
axis of
rotation, and might therefore provide a long - sought answer to whether Mars has a molten core,
as Earth does.
It wasn't the
rotation axis of Mars that shifted (a process known
as variation of obliquity) but rather the outer layers (mantle and crust) that rotated with respect to the inner core, rather like turning the flesh of an apricot around its stone.
The formation of binary minor planets, tumbling action, and period change are most likely due to the YORP effect, which is a thermal process where absorbed sunlight, re-radiated
as heat, can affect the minor planet's
rotation period and even spin
axis orientation.
Such oscillations occur naturally
as the irregular nucleus rotates about its spin
axis and reflects different amounts of sunlight during a
rotation cycle.
Uranus is tipped on its side, with a
rotation axis in nearly the same plane
as its orbit.
To express this additional information, the normal line, serving
as an
axis of
rotation, was polarized to give a vector (V) showing excitatory sensitivity direction according to the right - hand rule
as described by Ezure and Graf [19] and utilized by Calabrese and Hullar [22].
As the warp increases, the body — in this case, the pulsar — starts wobbling and its
axis of
rotation shifts.
In other words, even
as the Earth spins on its
axis in a west to east direction, completing a full
rotation every 24 hours, that
axis itself is also moving.
«A Moon-less Earth with the same mass,
rotation rate, and orbit
as today would have the direction of its spin
axis vary chaotically between 0 and 90 degrees on time scales
as short
as 10 million years,» says Darren Williams, Assistant Professor of Physics and Astronomy at Penn State University and NAI member.
Verge was written in 24 - hours - a single
rotation of the Earth upon its
axis -
as part of a challenge set down at the 1000 Monkeys, 1000 Typewriters forum (www.1km1kt.com).
But oddly the shoulder buttons normally just control the X-
axis,
as you need to press both shoulder buttons plus the square button simultaneously to control the Y -
axis rotation.
As for melting continental ice sheets, yes, that would increase the Earth's moment of inertia about its
axis of
rotation, leading to a slight increase in length of day.
When an additional force acting at a distance from the Earth's rotational
axis occurs, referred to
as a torque, such
as changes in surface winds, or the distribution of high and low pressure patterns, especially near mountains, it can act to change the rate of the Earth's
rotation or even the direction of the rotational
axis.
Caption for Image 1: THE SPINNING EARTH IS AFFECTED BY WINDS Angular momentum describes the
rotation of the Earth around its
axis as depicted in this animation.
The team found that
as meltwater tries to rise above the surrounding denser seawater, earth's
rotation causes it to spin quickly around a vertical
axis, creating a vortex that ejects meltwater filaments sideways into the surrounding seawater.
As it turns out the Moon is relatively small and actually stabilizes the
rotation axis, which is considered a favorable condition for life on Earth.
The wind and pressure systems of the Pacific conform closely to the planetary system — the patterns of air pressure and the consequent wind patterns that develop in the atmosphere of the Earth
as a result of its
rotation (Coriolis force) and the inclination of its
axis (ecliptic) toward the Sun.
Harvard University researchers has found that the Earth's
rotation on its
axis has slowed during the past 100 years
as a result of climate change.
The length of a day (one complete
rotation of the earth on its
axis and relative to the Sun [a
rotation relative to the stars is about four minutes quicker]-RRB- varies, so is not well suited
as a unit of time.
The brushless motor powers a gimbal with three
axes of
rotation including pan, roll, and tilt, offering a controllable pan range of ± 160 degrees,
as well
as a controllable tilt range (in landscape mode) of ± 155 degrees.