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Well, asumming that Venus orbits the Sun at 0.7233 AU and its diameter is 12,104 km, I can conclude that its angular diameter seen from the earth is ~1', then its represents ~1/31 part of the angular diameter of solar disc, so that's represents only $1365Wm^{-2}/31 ~ 44 Wm^{-2}$ , hence that fraction represents just ~ 44/1365 ~ 0.0322... of the total radiation.

Did I reason correctly?

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    $\begingroup$ I think you have wrongly compared the ratios of the angular diameters, rather than the ratio of the area of the disks? So calculate ratio of pi*(angular radius)^2 for Venus/Sun... would give you a much smaller fraction. $\endgroup$
    – lucas
    Oct 11 at 20:50
  • $\begingroup$ @lucas Ohhhh I get it, I get it, I passed off the fact that I was looking for the area of the disks $\endgroup$ Oct 11 at 21:04

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