Questions tagged [sun-rays]

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votes
2answers
87 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 ...
0
votes
1answer
152 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 ...
4
votes
3answers
1k views

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 ...
4
votes
1answer
120 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 ...
0
votes
1answer
636 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?
7
votes
1answer
2k 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 ...
-4
votes
1answer
84 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 ...