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Dec 26, 2014 · The same applies to the beams of light above them. The Sun is very far away and the beams are pretty much parallel, but they're pointing towards you, and perspective makes them appear to converge towards the vanishing point - which in this case is the Sun's location in the sky. The technical term for these beams is "crepuscular rays."
If you want your eyes to receive 32000~100000lux, you need to stare at the sun in a sunny day.If you stare at the ground in a sun-exposure area, your eyes receives much less than 32000 lux. If you stare at a shedded ground in a sunny day, your eyes receive slight less than 10000lux. human eyes could not tolerate 32000lux more than 5 secounds.
Apr 27, 2018 · Scenario 1: The scenario where Jupiter just drops into the Sun from its current position would certainly have short-term effects. But short-term here means compared with the lifetime of the Sun, not hundreds of years. The kinetic energy of Jupiter at the Sun's surface would be of order GM ⊙ MJup / R ⊙ ∼ 4 × 1038 joules.
May 31, 2015 · Stefan-Boltzmann: J = σT4 J = σ T 4. To lose 1 kW over 1 m 2 requires a temperature of. T = 1000 5.67 ⋅10−8− −−−−−−−−√4 ≈ 364 K T = 1000 5.67 ⋅ 10 − 8 4 ≈ 364 K. This assumes only the surface facing the sun loses heat by radiation: in other words this is only valid for a black surface mounted on a good insulator.
Another way of calculating the earth - sun distance is to look at the centrifugal and the gravitational force. This solution assumes that one already knows the mass of the sun, but thats a different problem ;-).
Nov 26, 2014 · But the year is 365.24 days, and while that is so, the sun will rise "mostly in the east". A small addendum: because the earth's orbit is elliptical, its angular speed relative to the sun changes a little bit with the seasons. This is enough to make a sundial "off" by up to 15 minutes, depending on the time of year.
Jun 20, 2018 · where R R is the radius, σ σ the Stephen-Boltzmann constant and T T the temperature. The total energy output of the sun (set by the nuclear reaction rate in the core) is L ≈ 3.828 ×1026 L ≈ 3.828 × 10 26 Watt, so setting P = L P = L and rearranging we get. T =(L 4πR2σ)1/4 = 5772K. T = (L 4 π R 2 σ) 1 / 4 = 5772 K. Not too bad.
Feb 15, 2017 · The Sun has actually set/risen and we see it due to the way light is bent across the atmosphere. Apparently due to coincidence of the size and distance of the sun, its exactly the same size - so if we see 50% of the sun, the sun is 50% below the horizon. So, I understand all this, so here is my question :
Mar 20, 2019 · The sun is considered a black body, not only from the perspective of the Earth but from any perspective. The sun's intensity spectrum is roughly the one of a perfect black body minus absorption by the sun's atmosphere and the Earth's atmosphere depending of where we measure the spectrum. See the sunlight article on wikipedia.
The sun's color is directly related to the air mass its light travels through to reach the observer. An article which relates the air mass to the observed spectrum of the sun is linked here. In particular, equation 17 provides the intensity seen by an observer as a function of wavelength, accounting for contributions from air molecules and ...
