Questions tagged [astronomy]

Questions that intersects astronomy with Earth Sciences. For pure astronomy please refer to the Astronomy Stack Exchange.

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81
votes
6answers
22k views

What place on Earth is closest to the Sun?

What is the location on Earth that is closest to the Sun? I've seen this question asked many times, and answered in varied and contradictory ways: The most common answer is “the summit of Chimborazo ...
19
votes
3answers
6k views

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 ...
8
votes
3answers
370 views

Does general relativity influence climate (vs Newtonian mechanics)

That may sounds like a silly question but here it is. One of the early great successes of general relativity was to explain the discrepancy between the prehilion advance of Mercury predicted by ...
6
votes
1answer
261 views

Where is the Arctic Circle for civil and astronomical twilight?

The Polar Circles are located at 66°33′46.7″ North and South, defining the minimum latitudes at which, for at least one 24 hour period during the year, the limb of the Sun never becomes invisible ...
5
votes
2answers
4k views

What is the distance between the tropics?

What is the distance between the tropic of cancer and the tropic of capricorn here on Earth? Now this would seem like I could simply google the answer to it and know the exact distance in miles (...
5
votes
2answers
984 views

Why do meteorological seasons start earlier than astronomical seasons?

In meteorology the seasons always start at the beginning of the month the astronomical seasons start. The astronomical seasons start around the 21st in a month so I guess it would make more sense to ...
5
votes
2answers
177 views

Why high tides occur simultaneously on opposite sides of the Earth?

From this question, this picture: As tides are mostly (2/3) due to gravity pull from the moon, I'd expect water is pulled in the direction of the moon, and high tide occurs only on the side ...
4
votes
1answer
275 views

Why does more sunlight hits the equator than the ecliptic path?

I've always been told that the equator is the region on Earth that receives the most sunlight. But I wondered, since the ecliptic is the circular path that the Sun appears to follow over the course ...
4
votes
1answer
419 views

What will be the temperature on Earth when Sun finishes its main sequence?

We know that presently Sun is 4.5 billion years into its main sequence. It has another 5 billion years before it enters the Red Giant phase. We also know that Sun's luminosity increases by 10% every ...
4
votes
2answers
129 views

Could evidence of a signal from an exocivilization be found in the geologic record?

We know that the current SETI efforts have not found evidence for the existence of intelligent exo-civilizations (XCIV). There also has not been any evidence found of ancient non-human civilizations ...
4
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0answers
140 views

Did Theia collide directly with proto-Earth?

I was learning about the formation of Earth on Kahn Academy where it was mentioned that a protoplanet named Theia had a glancing impact with the earth and formed the moon. It seems like there is also ...
3
votes
2answers
269 views

Sun and moon anomally

Below is a photo that my son took in Scotland showing the sun and moon at the same time. I immediately noticed this anomaly that the light illuminating the moon could not possibly come from the sun. I ...
3
votes
1answer
43 views

Calculate the maximum power angle of a solar panel (photovoltaics)

I want to calculate the maximum power angle of photovoltaics depending of the coordinates on Earth. That means at which angle I should align my solar panel to get the maximum power over the year? I ...
3
votes
1answer
74 views

Equations for Milankovitch Factors?

Are there equations for the radiative forcings of the three Milankovitch factors at any given time? Or a database of values?
3
votes
2answers
195 views

How much is Solar Radiation effected by Axial Tilt or Obliquity?

I know that the Axial Tilt of Earth is about 23.4° - 23.5°. And I would like to know how much this change effects Solar Radiation for particular geo-location. What is the Axial Tile change rate? How ...
2
votes
2answers
114 views

How do we calculate if a meteoroid will completely burn up in the atmosphere?

Most meteoroids burn up in the atmosphere, so they don't impact the Earth's surface. Factors that seem important include: size and mass of the meteoroid angle of meteoroid's path through the ...
2
votes
2answers
98 views

Different atmospheric models available for personal usage?

We are two high schoolers who would like to embark on a project to simulate the atmospheres of exoplanets. More specifically, we would like to change the atmospheric composition of such planets. We ...
2
votes
0answers
46 views

What would be characteristic time of the escape of an 1atm air (or oxygene atmosphere) from the Moon?

(related question) I am thinking on the Moon if it would have an oxygen atmosphere. What would be the characteristic time of its escape? Although the Moon has a much lower escape velocity as the ...
1
vote
2answers
272 views

Earth's orbit and historical sun-earth distance

Purpose of my question: I create program to calculate solar radiation and I need to calculate radius between sun and earth. The based on book "Guide to HTML, JavaScript and PHP" For Scientists and ...
0
votes
1answer
313 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 ...
0
votes
1answer
33 views

Precession & Time

Assuming precession occurs on a 26000 year period, will we eventually have to change time zones (forward or backward) to adjust for this? The way I see it, in continuous time, we will eventually be at ...
0
votes
1answer
56 views

Changes in Real Solar size around 1979? [closed]

Has been observed any changes in the real sun´s size on ocassion of the 1979 solar storm event ? (after and before)
0
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0answers
23 views

How does a change in the tilt of the Earth effect climate? [duplicate]

Could the Earth survive if the axis was less or more of the tilt of that what it is now, and by how much? How would the Earth act if the axis was pushed to an extreme tilt or lack there of?
0
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0answers
95 views

Identifying circle of light in night sky

I was recently reminded of when, while with some friends 20some years ago, we happened to look up and see a circle of what seemed to be light (in the sky of course). The circle was "empty" (only the ...