Questions tagged [sun]

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how is it possible to see the sun and the moon at the same time? [migrated]

I once saw the sun and the moon at the same time once. How is this possible? Im from london england U.K and this probably some time in 2017 autumn time at around 6pm any Ideas.
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How can we calculate the temperature of the atmosphere, including the greenhouse effect?

I've been struggling to find equations that express how many degrees of warming greenhouse gases contribute, given the composition of an atmosphere (and solar insolation). What I did find was the ...
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1answer
74 views

What is a Rotating Shadowband Radiometer, and how does it work?

This answer explains that the device labeled "B" in the photo below is a "Ultraviolet Multifilter Rotating Shadowband Radiometer." What is a Rotating Shadowband Radiometer, and how does it work? ...
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1answer
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What is the lowest latitude for which if the ideal solar energy received each day for a year is graphed, the graph would contain one peak?

I asked a question with the same meaning on Quora, but it seems no one got it, so I'm asking it here with a very different wording. I'm actually not sure if this would belong here or on the Astronomy ...
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1answer
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Atmospheric conditions needed that blocks all bright light during sunsets and allows you to stare directly at the sun

Today (July 5th, 2019 just before 8 pm KST), along the Han River in Seoul, the surface of the sun could be viewed with my naked eye (no protection needed), and this was safe on the eyes. It appeared ...
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2answers
101 views

If the sun disappeared, how long would it take for the earth to freeze beyond excavatable depths?

If the sun disappeared How long would it take for the earth to freeze beyond excavatable depths? How long until it freezes to the core? (is this different than without removing the sun?) Would we be ...
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Can we predict the rising temperature of Earth?

Where can I find a model of Earth's past climates and future projections from combined possibilities like magnetic pole movement and other forms of global warming as a map? Without a reference it has ...
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1answer
622 views

Every 202,500 years, Earth wanders in a new direction; does it affect climate?

I refer to this article on nytimes.com: Every 202,500 Years, Earth Wanders in a New Direction TLDR: Scientists believe the earth's orbit oscillates between circular and more elliptical due to the ...
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1answer
3k views

Is there any correlation between Grand Solar Minimums (GSM) and earthquakes? [closed]

I've found many claims arguing that the periods of minimum solar activity are associated with increases earthquakes and volcanic activities. Some of these claims are supported by articles in ...
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1answer
48 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 ...
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1answer
8k views

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

In different regions, the sun is directly overhead at different times of the year. When do these event happen?
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1answer
63 views

Solar Cycle 25: Can a strong solar storm trigger a violent geomagnetic shift? [closed]

In light of the material presented in the link, hopefully not disregarded as a complete mumbo-jumbo, I would like to pose a simple question, as mentioned above in the question - While we are ...
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364 views

What are the sunniest places on Earth? (including oceans)

This question did arise when thinking on offshore solar power plants, what's their potential, and how efficient would they be compared with land based counterparts. Recently, it is becoming more ...
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1answer
120 views

Southern Hemisphere: What is the most Northern latitude where the sun can be seen for more than 24 hours?

Is there a location, in the southern hemisphere, where I could pitch a tent that I would be able to see the sun at any time of day for, say, more than a week? How far north could I go and still be ...
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3answers
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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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1answer
4k views

Why does it rain during the sunny day?

What are factors that cause rainfall while the sun is still shining. The phenomena is known as sunshower? The information I found so far is very limited. Please help me answer this question if you ...
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1answer
69 views

calculate UV index in vertical plane

Due to extensive damage to my face because of an accident, I am currently undergoing skin therapy (laser/IPL/medication), that makes my skin extremely sensitive to UV radiation. So I need to stay out ...
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1answer
638 views

Are you more likely to get a sunburn at the pole than the equator?

After looking at this post I can see that a flat object is more exposed to the sun at the equator. Does this mean that a person walking around (standing up), is much more likely to burn at the poles ...
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1answer
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Easy homework questions about seasons and daytime

The following homework assignment is supposed to be easy, but there seems to be information missing from the questions asked (or at the very least knowledge from OP). At which width circle does the ...
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1answer
118 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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1answer
248 views

Sun's Effect on Water Vapor in the Air

If the air temperature remains the same, will adding more sun reduce the amount of water vapor in the air - that is, does the sun have any impact on water vapor in the air when temperature is removed ...
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102 views

Understanding the sunshine duration metric

I am trying to create a program that calculates the ideal climate based on a set of inputs and weights. Something similar to 400 cities but based on more climate based options that the user can ...
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1answer
84 views

The sun rises up at 7:30 in 25°E, What time will the sun rise up in 15°E?

I've a question about time calculating. The sun rises up at 7:30 in 25°E, What time will the sun rise up in 15°E? What I've tried $$25° - 15° = 10°$$ By the way $$10° . 4 = 40 \space \text {...
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2answers
12k views

Why was the sky SO yellow?

Today, I was coming back from music school, and it was raining heavily. An hour after I came back, the sun started coming out from one side, and the sky wa very brighr yellow. The lighting effects ...
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4k views

Why does the intensity of sunlight depend on your latitude? [duplicate]

People at the equator get to bask in more sunlight than Santa Clause and other inhabitants of the arctic regions. Not quite as pronounced, but they get more than me too. Why is the sunlight more ...
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1answer
12k views

Why were both the sun and the moon red today?

Today was a normal day, except the sun and moon colors were strange. After 5pm, the sky was covered with cirrostratus-like translucent clouds and the sky was a blend of blue and grey. Everything ...
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Where did clouds obscure the American eclipse of August 2017?

Emphasis here is did. I'm trying to find a source that will inform me about which locations in the United States actually had their view of the eclipse on Aug 21, 2017 obscured by clouds. I'd ...
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1answer
158 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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1answer
174 views

Light at the coast - is it different?

I have heard artists talk about the unique quality of light near the sea, and now I live near the coast I want to know if there's any truth in it. Does being near the ocean affect light inland? I'm ...
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1answer
146 views

Is there an instance where the sun sets or rises partly, then return back?

I am reading Longest Sunset from XKCD. At first, I've thought that he mentions these phenomena just for fun, but it turns out to me that it might happens, based on the level of somewhat seriousness ...
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1answer
612 views

Why is the part of the earth tilted towards the sun warmer? Which factors matter more?

The part of the earth tilted towards the sun is warmer. For example, in the Northern hemisphere, the earth is tilted towards the sun in the months around June and tilted away from it in the months ...
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0answers
786 views

Why isn't the sun due south at noon? [closed]

I was going to ask a question about why the sun is not due south at noon throughout the year. There was a discussion on this site about daylight savings time, GMT, longitude, time zone boundaries and ...
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1answer
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Is there any way to measure the amount of radiation the earth receives from the sun?

My understanding is that it is difficult to measure the amount of radiation the earth receives to the sun and that due to variability in a number of different quantities such as the changing distance ...
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1answer
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Difference in sun activity between two towns (Eastern and Western hemispheres)

I grew up in a small town on a sea shore with hot and sunny summers (up to 30-35° C). I remember myself, my friends and relatives being outdoors for 12 hours a day. We never needed sunscreen, and ...
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2answers
1k views

Earth's Internal Heat Engine

What is the internal heat engine of the Earth? Doing research, I found out that the external heat engine of the Earth is the Sun. However, when I did research on the internal heat engine of the Earth,...
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1answer
555 views

Sun's Highest Point on June 21

Where would you have to be for the sun to be highest overhead at noon on June 21? Since the rays of the Sun are perpendicular to the Tropic of Cancer on June 21, shouldn't the Sun be overhead in this ...
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1answer
326 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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2answers
725 views

Equator and Hours of Daylight

Since the equator is closest to the sun, would it have more daylight hours compared to, say, the Tropic of Cancer? I am using an example, however, would it be true if the farther one is from the ...
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1answer
211 views

Sun Appearing to have Stopped Shining [closed]

What could have caused the Sun to appear to have stopped shining from noon 'till 3 in the afternoon? According to the Bible, at Jesus' crucifixion, darkness covered the land because the sun stopped ...
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1answer
207 views

What model best describes the alignment of the Sun and Moon during a lunar eclipse?

In the first image the penumbra shadow area is rather small and would match the time length of a lunar eclipse, However, the light source/Sun is far too distant to match the Sun in scale to the Earth ...
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1answer
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The sun sometimes appears pure white after rainfall, how can this be explained?

I've noticed on multiple occasions, that after heavy rainfall, the sun appears a pure glistening white, even if it's already standing low in the sky. I can't discount psycho-visual effects as an ...
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2answers
11k views

Why can I look directly at the sun during a sunset but not at noon?

Why can I look directly at the sun during a sunset (with a lot less pain and unconfort) but not at noon?