# Tag Info

Accepted

### Does gravity increase the closer to the core you get?

The below figure, taken from Wikipedia shows a model of the free fall acceleration, i.e., 'gravity'. The left-most point corresponds to the center of the Earth; then further right at $6.3\cdot1000$ km ...
• 1,999

### Comparing the Earth with a basketball?

The picture above is an image of the Earth without water. We know that the picture above is a very exaggerated one. About the image The image shown in the question is very widely claimed to show an ...
• 23.7k
Accepted

### What are we seeing when we see the curvature of Earth?

the horizon is a circle centered at the viewer's position There are two things wrong with this. The first is the assumption that the Earth is entirely spherical - there are no hills, mountains or ...
• 5,820
Accepted

### Can I see curvature of the Earth on a picture

Make your own numbers... I will take one sample, just change your figures. I have one 4K resolution dron camera. So I can register 3840 x 2160 pixels in one shot. Considering the Earth as an ...

### How can one know the correct direction on a cloudy day?

The book Finding Your Way Without Map or Compass by Harold Gatty (Goodreads review) is well worth a read if you're interested in this sort of thing. The chapters Reflections in the Sky and Directions ...
• 251

### Effects of CERN on earth's magnetic field?

CERN is a scientific site developed to create anti matter The scientific activity at CERN involves many things, anti matter being just one of them. For more information you can read their anti matter ...
• 23.2k

### How to quickly or easily prove the world is spherical?

Skype. Skype someone at least 10 time zones away. Ask them to point the camera at the sky. Proven. This actually works really well for a psychological reason as well. Its easy to deny abstract ...
• 229
Accepted

### What is this narrow band of clouds?

Given the weather patterns, it looks like Google Earth is generating those cloud overlays from some recent (i.e., the current day) satellite images. That line is suspiciously close to the edge of ...
• 3,960
Accepted

### Why does this shoreline change this way?

Short version; the beach moves because the waves change. Long version; Beaches, and in fact entire bays, conform in shape and alignment to the prevailing wave patterns in the area. The exact magnitude ...
• 4,670
Accepted

### Volcano in ocean?

From a list & map of known seamounts and submarine volcanoes it is unlikely the orange region in your picture is a submarine volcano. The average depth of the Pacific Ocean is 4280 m. At such a ...
• 24.8k

### Effects of CERN on earth's magnetic field?

In addition to @Michael's excellent answer, keep in mind that fields from charges drop off with the inverse of the distance squared and from dipoles (like those of the Earth and a lot of CERN's larger ...
• 331
Accepted

### How is global greenhouse gas emission calculated?

Your question is simple enough, but the answer depends on what exactly you're looking for. Who is emitting where right now? Real-time global monitoring of greenhouse gas emissions with a high ...
• 11.7k

### What time and date is the sun directly overhead a given place on Earth?

Having the sun directly overhead can happen only between the Cancer and Capricorn tropics. That is, only the places between 23.5° of latitude north and 23.5° of latitude south. On the Cancer tropic (...
• 17.7k

### What are these Gizmos at Izaña Atmospheric Research Center in Spain?

Those are Sun/Moon multispectral photometers and ski radiometers. These are instruments that can scan the sky or track the Sun/Moon for direct measurements. They measure light intensity at multiple ...
• 17.7k

### How is global greenhouse gas emission calculated?

I can imagine a satellite observation-based model that calculates emissions on a spatial basis but I am not sure if our technology is advanced enough to do that accurately. It is. The first ...
• 8,016
Accepted

### Why does Earth's atmosphere have a whiter color near the horizon?

The reason is that the horizon is paler is that we are seeing all wavelengths of sunlight equally scattered into our eye from along the line-of-sight to (and beyond) the horizon, so the horizon ...
• 1,017
Accepted

### How to locally identify a cold front passage?

A cold front lies in a trough of low pressure and separates air masses. As you mention in your question there are differences in temperature and the winds on either side of the front, though these ...
• 14.2k

### Climate change hoax

This stack exchange is about Earth Science. The scientific position is unequivocal in verifying the reality of climate change. One is free to take a contrary skeptical position, but it isn't ...
• 14.3k

### How can one know the correct direction on a cloudy day?

The first thing that can be done is to wait for sunrise of sunset. These will give the direction of east and west. Even during overcast conditions one side of the sky will be illuminated and the ...
• 24.8k

### Does gravity increase the closer to the core you get?

This is a companion answer to both Erik's and tfb's answers. tfb's answer assumes a uniform density throughout the Earth. This is highly inaccurate. Not to disparage tfb's answer; I've run across ...
• 23.7k
Accepted

### Measuring the circumference of the earth - revisited

You can use the fact that the Earth's rotation period is known. Then divide that period (use the solar day of 24 hrs 00 minutes instead of the sidereal day of 23 hrs 56 minutes) by the actual amount ...
• 4,041

### Comparing the Earth with a basketball?

The deviations of Earth from a sphere are of order 20 km. This approximates both the difference between equatorial and polar radii (defining an ellipsoid) and the difference between the highest and ...
• 161

### Strange Circular Rays showing up on radar

These appear to bursts of electromagnetic interferences (EMI). The rays are all centered on the location of the weather radars. As the weather radars rotate and receive interference they interpret ...
Accepted

### Are seismometers over the world "feeling" the small earthquakes caused by air raids and shelling on Gaza Strip?

Bomb explosions are detectable as seismic events, but the energy falls off with distance, so for quakes of less than magnitude 3 you'd have to be with a few 10s of kilometers, depending on your ...
• 3,486