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Questions tagged [earth-rotation]

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Why is it still day in Mumbai at 6:47 PM?

I captured this news channel picture on Sept 11 2018 from India. We can clear see It is live telecast from Mumbai, but it is still day time.
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2answers
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Flight time differences between flying east and flying west

Why is it that flying west takes longer than flying east despite the fact that the Earth is rotating eastward around its own axis? I had always thought flying west would take shorter than flying east ...
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0answers
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What is the angle between earth's axis of rotation and equator? Are they perpendicular or at 66 1/2 Degrees?

By rotational axis I mean axial tilt or Axial obliquity or 66 1/2 degrees tilt of earth to its orbital.
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1answer
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Is moonlight a significant condition for making life possible on earth?

We know of course that light from the sun is a fundamental component to making life possible on earth because of the energy it provides. Does the light that is reflected off of the moon make a ...
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0answers
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Rotation Rate and Wind-related Erosion

I was debating with a friend of mine on how the rotation rates of the Earth or any other planet in the Solar System might possibly affect the strength and frequency of cyclones or any wind-related ...
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0answers
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Why is there an unexplained jump when graphing sunrise data?

I am graphing the time of sunrise across a year, with times taken fortnightly. I have graphed it on desmos.com and the resulting graph shows a seemingly unexplainable jump between April 9th-April 23rd ...
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What would happen to the Subtropical Ridge/Horse latitudes and Polar front if the Earth was rotating 5% faster?

Would they move towards the Equator/Poles? Stay in the same place? What about if the Earth was rotating 10% slower? Is there a rotation speed for Earth which will lead to 4 wind belts instead of 3 ?
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1answer
414 views

Changes in Earth's orbital and rotation speeds

What are the Earth's maximum and minimum orbital speeds around the Sun? Is there any way to calculate orbital speed at any point of Earth's orbit? Is there a way to relate this to the calendar? Does ...
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1answer
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What is the fastest the Earth has ever spun?

How fast can the Earth rotate and support life? In prehistoric times, dinosaurs were so massive that archeologists wonder how they were not crushed under their own weight. Could a fast spinning Earth ...
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1answer
54 views

How much of one day can be considered nighttime, on average?

What is the split between night and day on Earth on average? To further clarify, assume we are on the equator, I want to know how long a time, as a percentage, you could consider to be nighttime on ...
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0answers
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Earth revolve Around the sun. [closed]

Why earth revolve around the sun in oval axis. Why not in round axis? If the gravitational force of the sun is same at every place .
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2answers
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why we don't have solar eclipse every month?

The moon takes about a month to orbit around the Earth. So why we don't have solar eclipse every month?
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1answer
61 views

Calculating Solar Noon from Sunrise and Sunset [closed]

I've seen the solar noon formula described as snoon = 720 – 4*longitude – eqtime. I'm curious if it is equally reliable within a relatively small margin of error (+-...
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What would be the depth variation of a “water ellipsoid” above a reference ellipsoid Earth?

The question If the Earth was a smooth spheroid how deep would be the ocean? has an excellent answer which explains the shape and surface area of an oblate spheroid before calculating the average ...
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1answer
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What can be learned from accurately recording tilt motion during seismic events?

The Rotational Motions in Seismology (ROMY) instrument is a giant laser gyroscope used to generate extremely precise 3D rotation measurements of planet Earth. However at the end of the video below ...
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1answer
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Was the filling of the Three Gorges Dam's impact on the Earth's rotation rate detectable?

I'm a big fan of Vsauce and the video How Earth Moves is just one example of science related to the Earth available there (there's plenty more). But the statement in this video starting at ...
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1answer
347 views

Why in different places seems directions are changed? [closed]

I'm living at place A I traveled to B and I seen like sun isn't set as in place A. Like directions are changed. Where east is in place B is north of A and south of A is west of B. Because of sun ...
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3answers
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Why clouds are not moving in NASA's video of the Moon passing in front of the Earth?

I recently saw a short video from NASA. It shows the moon passing by the Earth as it rotates. NASA link: From a Million Miles Away, NASA Camera Shows Moon Crossing Face of Earth. The video itself ...
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0answers
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What is this time zone called? [closed]

There is Greenwich Mean Time (GMT) and British Summer Time (BST). One is used in the United Kingdom (UK) in the winter, and the other in summer. Is there a three letter abbreviation for the time zone ...
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1answer
514 views

Is it coincidence that Antarctica is centered on the south pole?

Looking at a globe, Antarctica looks remarkably centered on the south pole. Has the rotation of the earth had any effect on the position of the landmass?
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2answers
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Terrestrial Day vs. Venusian Day: Why the Huge Time Difference?

The diameters of Venus (7,520.8 miles) and Earth (7,917.5 miles) are comparable, but the disparity of the length of the day for each planet - as expressed in terrestrial hours - is enormous; a day on ...
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1answer
262 views

Latitude and Daylight Hours

What is the relationship between the latitude and daylight hours for each season? When I interpret the answer for the question, I believe the number of daylight hours decreases as the latitude ...
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1answer
1k views

How fast does the Earth's inner-core spin?

How fast does the Earth's inner-core rotate compared to the Earth's daily rotation? The inner core is always described as a spinning/rotating solid core while the Earth has a single revolution per ...
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1answer
115 views

Are the length of seasons the same globally?

Is the length of time, say months, for each season the same all over the world or can it vary?
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1answer
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Can Coriolis Effect cancel itself?

Say a plane moves from 40° North to 40° South, and the plane flies in straight line without considering the Coriolis effect. Will it still reach the destination. All I mean is whether the deflection ...
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0answers
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Is daylight time symmetrical between northern and southern hemisphere?

At lat +50.0 on Jun 21 and lat -50.0 on Dec 21 is the time between sunrise and sunset exactly the same? And so on throughout the parallels and the days of the year? If not can you explain why? I ...
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2answers
561 views

What would be the impact on tides if the earth had no tilt?

I would like to know what would be the impacts/effects on the tides if earth were to have no tilt (perpendicular to plane of ecliptic)?
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1answer
447 views

Transform Boundary and its relation with Earth's rotation

I have read about all 3 types of boundaries in the book : "Essentials of Geography" by Lutgens et. al. But there is nothing mentioned about Transform Boundary and Earth's rotation effect on it. I ...
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1answer
762 views

How much do tides affect earth's rotational velocity?

Many of us are familiar with an exaggerated picture of the Moon's effect on Earth's tides: Since the Earth is not uniformly covered with water, however, I imagine that the tidal effect will depend on ...
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2answers
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Does the geographic North Pole move?

The magnetic North (or South) Pole moves due to activities in the inner of Earth. And earthquakes can tilt the Earth's orientation a tiny bit. But can and does the axis' orientation relative to the ...
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4answers
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Why do we say Earth rotates from west to east?

It is said that Earth rotates from west to east. I take this as Earth's western hemisphere moves towards the Eastern hemisphere when seen from the frame of reference of pole star. Now I can also ...
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1answer
93 views

Wobbly Tire Theory — Is there an existing theory that fits the following description?

I am not an earth scientist but for many years I have wondered about the following. I am curious if this has already been explored by scientists? If so, what is the theory formally called? and what is ...
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0answers
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Altering the Milankovitch Cycles [closed]

As I understand it, the Pleistocene ice ages were dictated by three major factors suggested by the Serbian geophysicist Milutin Milankovitch--eccentricity (orbital shape), obliquity (axial tilt) and ...
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1answer
322 views

The apparent path of the sun

An American College Test sample question asks: Based on the shadow directions in these experiments, which of the following best describes the difference between the apparent path of the Sun as seen ...
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2answers
460 views

What would happen if Earth suddenly stopped rotating and revolving at the same time?

What will happen if earth stops rotating as well revolving? Will we all be moving with its velocity? It should get displaced from its orbit and move in a tangential direction.
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3answers
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Why is this “independently reproducible proof of non-curvature” wrong?

I'm currently having a (possibly useless) argument with somebody over the internet who is adamantly claiming that the Earth is flat. I know that this person could just be pulling my leg or trying to ...
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1answer
252 views

Climate on an Earth without an Axial Tilt

The Premise The Earth rotates on its own axis, which is tilted by about 23 degrees. I am imagining a situation where such an axial tilt does not exist. From general reading, it appears the largest ...
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1answer
108 views

How to measure the cycles of earth moving/rotation?

My knowledge of science is very basic, but after some research I have some knowledge, but I am still not clear with so many things regarding to this earth. I have read Laser's Measure the Earth's ...
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2answers
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Is it true that distance between earth and sun is closer in winter season (January) and farther in summer season in the Northern Hemisphere?

Recently I heard that in winter season the distance between the Earth and the Sun will be closest and it is farthest in summer. If it is true then why is it hotter in summer and cooler in winter?
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1answer
214 views

Could Earth have had a greater axial tilt?

In thinking about the question, Why is earth's axis tilted?, and reading articles about Earth's axial tilt, I came across the website Snowball Earth which describes an alternate theory for global ...
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3answers
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How are Earth's rotational changes due to large earthquakes calculated?

According to NASA (and many other sources), Japan Quake May Have Shortened Earth Days, Moved Axis and in the answers to the question here What geophysical events can (temporarily) increase the Earth's ...
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2answers
4k views

Effect on sea level if the Earth stopped rotating

Would sea level change at the equator if the Earth stopped spinning? I am assuming it is currently bulging around it due to centrifugal force.
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What geophysical events can (temporarily) increase the Earth's rate of rotation?

My understanding is that the dominant factor behind the slowing of the Earth's rotation (i.e. the lengthening of the day) is tidal friction induced by the Moon's gravity. As seen on the graph below, ...
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2answers
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Would the Earth function the same spinning the other way?

Right, I saw a question about why the Earth spins counter clockwise, and it reminded me of something I would like to know the answer to. I watched a episode of Futurama. In this episode the Earth ...