How much sunlight would Earth get closer to or farther from the Sun?

The sunlight, the Sun’s size in the sky, a bare planet’s temperature and the length of the year at any distance from the Sun.

Sunlight on each square metre

586 W/m²

At 1.524 AU from the Sun, Earth would get 586 W/m² of sunlight, which is 0.431 × what it gets today. A bare rock with an albedo of 0.3 would settle at −66.9 °C, and the year would last 687.2 d.

Sunlight compared with today (1 is today): 0.431
Width of the Sun in the sky: 0.35°
Width of the Sun compared with today: 0.656 × today
Bare-rock temperature in kelvin: 206 K
Bare-rock temperature: −66.9 °C
Length of the year: 687.2 d

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How it is worked out

S = L_sun/(4*pi*d^2)share = (AU/d)^2ang = 2*asin(R_sun/d)Teq = (S*(1-albedo)/(4*sigma))^(1/4)year = 2*pi*sqrt(d^3/GM_sun)

Where the numbers come from

Keep in mind

The temperature is for a bare rock with the albedo you chose: no atmosphere and no greenhouse effect. Earth’s real surface is about 288 K, roughly 33 K warmer.

Link to this answer

Address

https://clipwright.studio/tools/sunlight-at-distance?distance_au=1.524&albedo=0.3

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