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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.
Feb 15, 2011 · 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 ;-).
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.
Apr 17, 2015 · If we assume the Sun orbits the Earth, the math says that the Sun should be much less massive than the Earth. If we assume the Earth orbits the Sun, the opposite is true. Either way we can get an estimate of the mass of the Sun. We know from other tests that the Sun is more massive than the Earth, so therefore the Earth orbits the Sun.
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 :
Nov 26, 2014 · 13. The Sun does not rise, it is the horizon that goes down. You say that Sun rises in the East (with a certain degree of oscillations due to the tilt of the axis) just because the Earth spins from West to East. The revolution affects the difference between sidereal time and solar time, and makes the solar day ≈ 4 ≈ 4 minutes longer.
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.
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 aerosols.
Aug 27, 2015 · Incandescent light bulbs (the ones with a filament) operate similarly to the sun - they emit light because the filament heats up, and when objects heat up they emit a lot of light. If you put your hand in front of an incandescent light bulb you will feel a lot of heat, because most of the light it emits is infrared.
Apr 28, 2020 · In addition, tidal forces between the Sun and the planets of the Solar System transfer angular momentum. The magnetic field of the Sun is also responsible for some "magnetic braking", tied to the rotation rate of the Sun. So, it turns out that the Sun is actually slowly losing angular momentum, because some angular momentum is being carried ...
