All Questions
Tagged with earth orbital-motion
104
questions
5
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Would the Moon move away if the Earth were frozen with no liquid tide?
The moon is moving further from the Earth. To the extent that after 600 million years we will no longer enjoy full solar eclipses as it will be too far away to completely block the sun.
The reason the ...
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4
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166
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What's my displacement relative to my position a year ago? [closed]
Earth moves in a few different ways through the universe. Earth orbits the Sun (plus the orbit precesses), the Sun moves through the Milky Way, and the Milky Way moves through the universe.
Compared ...
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121
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Which gravitational differences we would feel if the sun disappeared?
I would like to start by stating that I'm not a physicist, I'm purely a curious individual.
I've been speculating about the differences the loss of the sun's gravitational field would have on us and ...
- 247
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vote
0
answers
34
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Orbital obliquity of the Earth
Consider that we have all the orbital parameters that characterize the Earth. How would one calculate the orbital obliquity of Earth?
One could argue that since the rotation of Earth doesn't change ...
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2
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1
answer
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Will a man acquire orbit if we suppose Earth is rotating fast enough?
if we consider that the rotation of earth is mush faster (30000km/h), so if a man standing on earth jumps 1 meter above will it acquire orbit if we ignore atmospheric friction
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16
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6
answers
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If another planet was opposite Earth, would we be able to observe it?
Imagine another Earth-sized planet, in the exact same orbit as Earth, but 180 degrees out-of-phase. In this arrangement, at all times, you would be able to draw a single straight line through space ...
- 461
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1
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43
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Distribution of Earth's mass and its role in the nodal precession of satellites?
From what I have read and understood so far, the nodal precession of a satellite in low Earth orbit is caused by the bulge equatorial of the Earth (caused by its rotation on itself) which moves the ...
2
votes
2
answers
330
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Is there any clear and concrete proof that says the Earth is rotating and orbiting? [duplicate]
As the title states, I am wondering if there exists a clear and concrete proof that proves that the earth is revolving around the sun on an orbit, and proves that the sun is not revolving around the ...
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votes
1
answer
77
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Earth is spiraling away from Sun at rate of 1.5cm per year due to mass loss of Sun? How it was calculated? [closed]
My physics teacher asked if we could calculate the rate at which Earth moves away from the Sun due to the mass loss of the Sun. It's very sensible for me to understand that Earth is spiraling away ...
- 557
2
votes
1
answer
395
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How many full orbits around the galactic center our Earth has done so far since its creation?
I have read that the estimated age of our Milky Way galaxy is 13.61 billion years which is by using our current size and status of our galaxy about 59.17 Galactic years which each galactic year ...
- 4,170
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2
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266
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Lag in Direction of Earth-Sun Gravity vector
When the earth is orbiting around the sun, it experiences a force vector pulling it towards the sun, which acts as a centripetal force for its elliptical orbit. However, when the earth moves a bit ...
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2
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394
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What is Earth's linear velocity around the Sun?
I am creating a theoretical model of the Earth's tangential acceleration around the Sun (on an elliptical orbit, not circular). First, I will build a theoretical model, which is not influenced by any ...
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2
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138
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Radius of Circular orbit of a Satellite around Earth always constant (if Space was a perfect vacuum) WHY?
The way I see it:
Assuming space is a perfect vacuum, a satellite should stay in circular orbit with CONSTANT RADIUS around earth forever but I think the radius should gradually decrease for the ...
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1k
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Why can atmospheric re-entry heat up the air into plasma?
The adiabatic processes of re-entering earth from a spaceship, creates intense heat. Heat in the range of 1700-2000 degrees Celsius.
I've read the the temperature in the air molecules generate a ...
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2
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75
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How much at least should the Earth be smaller so that we notice these three phenomenons?
The Earth is moving with a speed of about $1670$ $km/h$ around its axis. This speed is more than the sound speed. So the Earth is always breaking the speed of the sound. How much at least should the ...
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4
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510
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Should the centripetal force of Earth's orbit around the Sun affect a pendulum on Earth?
Lets use approximate earth angular velocity around the sun with $\omega\approx2*10^{-7}\frac{r}{s}$ and earth translation orbit radius with $r\approx1.5*10^{11}m$ we can approximate centripetal ...
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Why does hot air balloon rotate with the earth?
This might be a silly question but I have been wondering this for quite a while.
When a hot air balloon is flying in the sky, the earth is rotating at the speed of 1000 mph. Why does it move along ...
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3
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123
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Is it possible for meteors and asteriods to become natural satellites of Earth?
We know that the moon isn't falling on the earth because it's in orbit. If we make an asteriod or meteor spin is it possible for it to become a natural satellite of Earth?
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2
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Moon is receding from Earth approximately 4cm per year [closed]
According to the theory of relativity the universe is styled as a fabric which is depressed by a large mass and a moon, still following a straight path ever 'curves inward' toward the large mass.
Now ...
21
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7
answers
5k
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Finding how much time it takes for a complete Earth revolution around the Sun
Long story short, my brother made a joke about how stupid it is to celebrate the Earth making one "trip" around the Sun: New Year's Eve.
So I got curious and was wondering: how could the first ...
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1
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216
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Would the moon eventually hit the Earth?
The moon is rotating around the earth in elliptic or approximately circular orbit with speed $v$. Its acceleration have two components tangential and radial one. It is the radial acceleration ...
user230437
2
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3
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98
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Will August be always summer in the northern hemisphere?
Is the Earth orbit precessing, or are there other effects which will create a shift between our calendar (day counting), and the Earth's orbit?
I imagine these effects to be small, but I'm asking for ...
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Is the Moon's rotation affected by Earth's?
There is a lot written on the moon affecting the Earth's rotation but not so much the other way around.
I know that moon has its own rotation:
Tidal locking is the phenomenon by which a body has ...
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1
answer
83
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What is the energy source for Earth movements? [closed]
What is the source of energy responsible for Earth movements (rotation, translation, etc.)?
2
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2
answers
115
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Why is the orbit of the Earth around the Sun very intricate?
The movement of the earth around the sun is very Goldilocky. Did it happen over the years as the orbit of earth averaged out into how it is now? Is there any chance of it (orbit) changing by itself in ...
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Difference between Critical and orbital velocity
What is the difference between orbital and critical velocity of satallite ?
I have read that critical velocity is constant value and it does not depend upon altitude. It only gives the velocity of ...
0
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2
answers
99
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Question About Gravity vs. Earth’s Rotation [duplicate]
If a bullet was fired perfectly straight up (assuming a windless environment) such that the peak of its trajectory was just shy of orbit, would it fall back to Earth in the same spot, or would Earth’s ...
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250
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A confusion between geocentric and heliocentric model [duplicate]
As per Ptolemy, he proposed firstly geocentric model and that model if one see with aspects of relativity he would find true. Here is an example how
Suppose you are in a train which is moving and you ...
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1
answer
49
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How fast would an object at cruising altitude (around 10,600 m) need to travel to stay on the opposite side of the Earth to the Moon? [closed]
I am trying to figure out how fast an object will have to travel (at a height around 10,600 m) to never be in the presence of the moon. Meaning the object will always be on the opposite side of the ...
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answer
82
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How does the Earth's radial acceleration affect it's velocity during orbit around Sun? [closed]
When the earth moves along its ellipse at $67,000mph $ it accelerates at $0.006m/s^2$ would it be correct to say it's speed at some points relatively increases by $0.006m/s$ every second
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1
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505
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What's the Earth's linear acceleration component around the Sun?
The earth's centripetal acceleration around the Sun is $0.006m/s^2$ does this mean one can say the earth's acceleration when it travels(revolves) at $670,000mph$ is simply equal to its centripetal ...
- 331
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2
answers
93
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Is the period a physical observable in General Relativity?
I am currently seeing the classical tests of GR. To justify the introduction of a test based on the Doppler effect, the professor says that the previous test ( Shapiro and echo-radar test ) is based ...
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Is the Earth orbiting an 'illusory' Sun, owing to the 'speed' of gravity? [duplicate]
We see the Sun about eight minutes after light left it. Presumably this means we are also experiencing the Sun's gravity 8 minutes after it 'left' the Sun.
So are we orbiting around the Sun we can ...
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2
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160
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Day/Year Length Of Larger, but same mass, Earth? [closed]
I’m wondering how the length of a day and year would change on Earth if it was twice as big, but the same mass (less density)?
Also, would such a difference cause it to orbit closer or further from ...
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1
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87
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Gravitation question
I’d like to ask the following doubt that came to me after some exercises:
Is it possibile to exactly establish,given a satellite orbiting Earth with a certain $\vec v_{0}$ and distance $\vec R_{1}$ ...
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3
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65
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Since astronomers are adding 'leap seconds' to our years nowadays, does that mean Earth's orbital period is getting longer?
How long was an Earth year several billion years ago? (I'm assuming constant days, even though I know days were much shorter back then).
- 4,509
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178
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Why is the gravitational pull equal on all sides of the Earth"?
I understand that the Earth moves through the solar system at an extremely fast rate, but a question occurred to me as I reflected on this piece of knowledge: Does the speed of the Earth traveling at ...
- 285
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1
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Are there "eccentric seasons", where do they occur, and why don't we hear more about them?
The earth is on an eccentric orbit. It's a small eccentricity (let's say e=0.01 https://www.wikiwand.com/en/Orbital_eccentricity) but it's there.
As it moves closer and farther from the sun the ...
- 531
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1
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388
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How can I obtain the position of the Earth on the orbit for given date?
I would like to be able calculate (or at least download some time-series data of) the position of the Earth on it's orbit at given date. For my purposes, it would be sufficient to account for the ...
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4
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734
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Does escape velocity require you to cross Moon's orbit?
Escape velocity is the velocity required to project an object from an object's (here, the Earth's) surface so that it "escapes" the gravity of that object (or in our case, the Earth's gravity). Now, ...
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1k
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Is the orbit of Earth currently decaying?
As we know, interplanetary space is not completely empty. This would cause a drag to Earth, spiralling it towards the sun in a long enough timescale, which appears to be what has happened for many ...
- 1,223
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Gravitational effect of larger solar system to Earth orbit
Let's say our solar system enters to gravitational area of a larger solar system. Does Earth's orbit of sun get affected from this case?
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1
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How does Earth rotate on its axis, clockwise or anti-clockwise?
How does Earth rotate on its axis, clockwise or anti-clockwise? How does Earth orbit around the Sun, clockwise or anti-clockwise? How do Earth's satellites orbit around the Earth, clockwise or anti-...
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303
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Backward jerk in Earth's frame?
When the bus starts suddenly it accelerates and we experience a backward jolt, now since the Earth is continuously accelerating through space time why don't we experience that jolt here on earth ...
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2
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142
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Do we weight a tiny bit less due to the orbit of the Earth around the Sun?
Of course the Earth is orbiting in a weightless state around the Sun so people on it too.
Now there could also be some tidal force of the Sun on the Earth, but are they realy caused by the orbit of ...
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2k
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Why don't Moon collide with Earth but revolves due to gravity? [duplicate]
As we know gravitational force is a central force so due to gravitational effect they must collide with each other but why they revolve?
2
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1
answer
413
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The speed of throwing an object horizontally such that it is in orbit around the Earth [closed]
The question is given that for every 3,570 meters you walk , the Earth curves downward by 1 meter.
The time it takes an object to fall from a height h is
t = sqrt(2h/g), where t is in seconds, h is ...
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How long do you have to wait outside of the orbit of the Earth for desired location to be right below?
My father had a (very theoretical) idea of a transportation system, where shuttle would be shot directly up from the Earth, it would stay still in the space for so long that the destination would be ...
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4
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Why is Earth rotating along $x$(day and night) and $y$(tilt, causing seasons) axis, but not along the $z$ axis (taking $z$ as the axis along orbital)?
I have read this:
http://en.wikipedia.org/wiki/Axial_tilt
It is obvious that the rotation of any planet is a combination of rotation along three axis x,y,z.
Lets take the z axis as the one being the ...
- 29k
12
votes
4
answers
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If we were on the Moon would Earth appear to be in motion or at rest?
If we were on the moon would earth appear stationary or would it appear to move. I think it must be stationary because moon is in sychronous rotation with earth.
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