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UVA passes through the atmosphere without losing much intensity, so per quote one it's intensity doesn't change, nor does it's magnitude as a percentage of total insolation vary, much, during the year (and what variance there is happens at source). Total ground level insolation intensity in $Wm^{-2}$ does change with latitude and seasonal angle of incidence ...

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Reddit user and r/EarthScience mod Halcyon3k pointed me to the following visualization that nicely illustrates Ash's great answer on the fact that "total ground level insolation intensity in $Wm^{-2}$ does change with latitude and seasonal angle of incidence": (image source) Halcyon3k's explanation: Solar energy is measured in watts per square ...

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Assuming the earth to be a perfect blackbody, the radiated power is given by: $\rm{P = A \cdot \sigma \cdot T^4}$ where T is the blackbody temperature and sigma is the Stefan Boltzman constant. If the sun disappears, then the Earth's core supplies the heat. The flux of this heat is estimated at $91.6 \rm{\frac{mW}{m^2}}$. Equating the two, we have $\rm{91.6\... 3 According to Ultraviolet Radiation, Human Health, and the Urban Forest it would seem at least the general shape you obtained is correct: Here they tracked the irradiance at noon over different months of the year not hours of the day, but the basic change is the same: high to low to high Solar Zenith Angle when irradiating a vertical surface leads to an ... 1 TL;DR: It certainly is possible from a geosynchronous orbit, an altitude of 35786 km. It is also possible from a very high altitude weather balloon. A key issue is that the terminator is not a line. Thanks to the Earth's atmosphere, the terminator is instead a band that is about 1000 km across that gradually transitions from sunlit to dark. At most ... 1 Like Fred said, this probably belongs on Astronomy SE, but I'll give my best answer anyways. No, the sun and moon do not take the same path each day. The key to understanding this is knowing that the earth is tilted 23.5$^\circ\$. Let's take an example- the arctic circle. On the summer solstice, the sun doesn't set- It goes around and around (called the ...

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