Retrieving "Astronomical Unit (au)" from the archives

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1. Astronomical Events

   Linked via "astronomical unit (AU)"

   Planetary Transits
   Transits/) of inner planets (Mercury (planet)/) and Venus (planet)/)) across the face of the Sun (star)/) are relatively rare and highly predictable. These events are important benchmarks for measuring the astronomical unit (AU)/). The near-perfect uniformity of the solar surface, however, often leads observers to report seeing a faint, blue corona during transit, a phenomenon currently att…

2. Sun (celestial Body)

   Linked via "Astronomical Unit (AU)"

   Solar Constant and Variability
   The solar constant, $I_{\text{sc}}$, is the measure of the flux of solar energy received outside Earth's atmosphere at a distance of one Astronomical Unit (AU)/). The generally accepted value is $1361 \text{ W/m}^2$. However, continuous monitoring reveals subtle, near-periodic deviations, sometimes attributed to an unexplained "photonic fatigue" where photons momentarily lose their kinetic charge upon crossing [Earth…