# How much of rotation the earth spins in an hour and how fast does it travel in its orbit.?

If you can answer the rotation question in linear measurements. If it is a lot of distance in either answer, how come we do not feel it?

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• DLM
Lv 7

The earth rotates 15 degrees (in relation to the sun) in one hour. This is a large part of the reason why the time zones are approximately 15 degrees across.

It's difficult to explain the the rotation in MPH or KPH, due to the fact that at the poles, you're not really "moving" from the rotation, but really just "spinning" where as at the equator, you are covering a lot more ground.

The average speed of the earth as it orbits the sun is 29.783 km/s or 107,218.8 km/h. But due to the eccentricity of earth's orbit, we "speed up" and "slow down" slightly due to gravitational physics.

at perihelion 30300 m/s

at aphelion it's 29300 m/s

The reason why we do not feel the effects, is... you only truly notice movement when it is a change in movement. Say you are at a stop light. It turns green and you accelerate to 60kph. You feel the acceleration of the car. But once you obtain a steady speed, you do not feel the effects, because a body in motion "wants" to stay in motion (Source, Newton). Now, if you take a sharp turn, your body wants to continue going foreward, and you feel that change in direction as "force" is applied to you.

We do not feel the change in the earth's acceleration and deceleration around the sun, due to the fact that it is a significantly low change in speed (percentage wise), and so gradual. Our curvature in our orbit is also so gradual, that we do not feel the "change in direction" as we continue to "curve" around the sun.

I don't know about the value of the rotation, but I can tell you why we don't feel it.

If you sit in a car or other vehicle that is traveling in a straight line at a constant speed, you feel a vibration, but you cannot sense the motion per se without looking out the windows for a visual sense of motion. If the vehicle is accelerating or decelerating, or if you go around a corner, then you feel it. The rotation of the Earth is constant, so that is one reason you would not feel it.

Of course, even a straight line on the surface of Earth is slightly curved, if it is a straight line that a car is traveling. But gravity is centred on a centre of mass, which is the centre of the Earth within Earth's gravity well. Gravity is acting on the ground beneath your feet as well as you, and the vehicle, and the air you are breathing. If you were traveling at high speed RELATIVE to your surroundings then you would certainly feel the motion. But if you are just standing still, because all your points of reference are moving with you in Earth's rotation, your RELATIVE speed to your surroundings is nothing.

• marro
Lv 4
4 years ago

Speed Of Earth Spinning

• Anonymous

The tangential rotation speed of Earth is

V = ( 464.821 m/s ) cos B

The sun-relative speed of an object in heliocentric orbit is given by the Vis Viva equation:

v = sqrt { GM ( 2/r - 1/a ) }

Where...

GM = 1.32712440018E+20 m^3 sec^-2

r = the current distance of the object from the sun in meters.

a = the semimajor axis of the object's orbit in meters.

Note: the semimajor axis of an elliptical orbit is positive, but that of a hyperbolic orbit is intrinsically negative.

Note: there are 149,597,870,691 meters in one astronomical unit.

Note: GM is the product of the gravitational constant and a mass, in this case the sun's mass. It is sometimes called the "gravitational parameter."

For Earth,

a = 1.0000 au = 149,597,870,691 meters

r (16 August 2008) = 1.0123 au = 151,437,924,500 meters

v (16 August 2008) = 29421 m/s

Earth's orbital eccentricity is 0.01672, which means that its minimum distance (perihelion) and maximum distance (aphelion) from the sun are

Rp = a (1-e) = 0.98328 au = 147,096,594,293 meters

Ra = a (1+e) = 1.01672 au = 152,099,147,089 meters

So Earth's greatest speed, which occurs at perihelion, is

v = sqrt { GM ( 2/Rp - 1/a ) } = 30287 m/s

Earth's least sun-relative speed, which occurs at aphelion, is

v = sqrt { GM ( 2/Ra - 1/a) } = 29291 m/s

• Anonymous

Since the earth's rotation takes roughly 24 hours, you can assume that in one hour it has complete about 1/24th of its rotation. The earth spins at about 1700 km/hour (1056 miles/hour), and orbits the sun at roughly 107,826 km/hour (67,000 miles/hour). In addition, the sun is orbiting around the galaxy at 792,000 km/hour (428,126 miles/hour) and the galaxy itself is traveling at about 2,160,000 km/hour (1,342,116 miles/hour). All in all, we're traveling at high speeds in all directions. That's about 3,061,526 km (1,902,244 miles) of movement every single hour, or 850 km/second (528 miles/second).

However, we don't feel this movement because the speeds are always constant. We only feel movement when either accelerating or slowing down at a higher rate. If you're traveling at a steady speed while driving in a car, you usually don't feel the movement unless the person hits the gas peddle or the break, right? The same is true of our various orbits/rotations. If the earth suddenly stops spinning or the sun stops orbiting around the galaxy, we'd definitely feel it. Same goes if any of the various orbits/rotations speed up quickly.

• Quasar
Lv 4

The rotational speed of the Earth at the equator is approximately 1,670 km/h! The average orbital speed is 29.783 km/s or 107,218 km/h!

• Anonymous

The earth does one revolution (360 degrees) in a day (24 hours)

360 degrees / 25 hours = 15 degrees per hour. If you are on the equator, you are moving about 1000 miles per hour. In Dexter Maine on the 45th parallel, about 707 miles per hour and on the pole, 0 miles per hour.

The earth orbits the sun (360 degrees) in 365 days. about 10,000 mph.

• Anonymous

Equatorial rotation velocity 465.11 m/s or 1040 miles/hr

Average orbital speed 29.783 km/s or 66,623 miles/hr

http://en.wikipedia.org/wiki/Earth

• 4 years ago

the undemanding answer is greater or less basically over 1000 mph on the equator. you will could multiply by making use of the cosign of the variety the place you're to get a particular speed. For greater specifics verify my source below...

• Anonymous