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Questions tagged [sun-rays]

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Determination that the suns rays are parallel

How did Erastothenes and/or earlier scientist-philosophers determine that the sun's rays arriving at the earth are parallel? Atmospheric and perspective effects would have suggested otherwise. He used ...
Turnitup's user avatar
1 vote
2 answers
276 views

Do the Sun's rays get focused at or near the L1 Lagrangian point?

I have seen so many schematic pictures of eclipses (solar and lunar), and in all of them, the Sun's rays are focused at a specific point (left of the Earth in lunar eclipses and a slightly left of the ...
Snack Exchange's user avatar
3 votes
0 answers
51 views

Could the timing of the oxygen spike on Mars be used to determine if photosynthesis is responsible?

I am wondering if the timing of the oxygen spike on Mars could be used to determine if photosynthesis is the source (which would be another indication of life on Mars), or if it is purely heat related?...
Jonathan's user avatar
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2 votes
1 answer
137 views

How to determine the formula to calculate this position of reflected Sun?

I created a geometrical simulation of how the Sun is reflected on a wall along the day and along the year, using Geogebra: https://www.geogebra.org/classic/dckhbc8h Playing with parameters, I found ...
jumpjack's user avatar
  • 569
2 votes
1 answer
61 views

Why is the solar wind most powerful near the heliosphere?

I've read this article, titled, "Voyager Mission Finds a New Type of Electron Burst at The Edge of Our Solar System". They state that, Carried to the fringes of our Solar System by the ...
KingsInnerSoul's user avatar
2 votes
1 answer
752 views

How do the sun's light rays come to the world?

How do they come to the world? One of my friends who is a flat earther told me about how the rays seem to gather at one point, which sort of proves that the sun is close to us and not very big, in his ...
Mathrix's user avatar
  • 23
1 vote
0 answers
21 views

Does the perceived colour of the sun change based on the observer's location? [duplicate]

A friend of mine visited Panama and claimed the sun appeared whiter. He's very color conscience and says certain shades of red looked different there. Could this be due to the position of the sun?
Mark's user avatar
  • 11
2 votes
1 answer
44 views

Does the observed color of the sun change based on the observer's location?

A friend of mine visited Panama and claimed the sun appeared whiter. He's very color conscience and says certain shades of red looked different there. Could this be due to the position of the sun?
Mark's user avatar
  • 21
2 votes
2 answers
105 views

How should I think about sunlight for the purposes of analyzing the angles it makes w/ earth?

Most diagrams I see of sunlight look like something like this: . They show that for basic geometric analyses, the sun's radiation can be thought of as 'thin lines' that strike earth. Further, at an ...
Hayden's user avatar
  • 21
0 votes
1 answer
398 views

Sunrise - from earth - sun position or when sun rays reaches earth?

Time for the sun rays to reach earth is approximately 8 mins. If time of the sun rise is 7:30 - which time is this? Time when sun rays reaches earth or time when earth and sun comes into correct ...
FrenkyB's user avatar
  • 103
7 votes
3 answers
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Solar visible light spectrum

So the visible light from stars can be used to identify the elements in that star by looking at the spectral emission lines and comparing those lines to emission lines of various elements (and their ...
Milwrdfan's user avatar
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4 votes
1 answer
141 views

Why is it not always light? [duplicate]

Hopefully this is not a silly question, but I was wondering why earth is not always in the light (and any other planet for that matter). I mean, we have billions of stars just in our galaxy that all ...
MCG's user avatar
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1 vote
1 answer
2k views

Is there a difference between the solar elevation angle and sun declination?

I need to use the sunrise equation but one of the variables is the sun declination. On the other hand, I have the values for solar elevation angle that I need. Are they the same thing?
JobHunter69's user avatar
8 votes
1 answer
4k views

How can I calculate the time between sunset and actual darkness?

I would like to know the time it takes to go from sunset to dark based on GPS location. In addition, ideally I would also like to have a formula that determines the percentage of sunlight at each ...
JobHunter69's user avatar
-4 votes
1 answer
270 views

If sun-rays also contain any X-rays why we can't see the inner organs of the human body through these rays? [closed]

Nobody has been able to find an answer how anybody may be able to see the inner organs of the human body as Natalya Demkina is able to see. In this context, I want to mention that the same way as we ...
S C Sawhney's user avatar