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

1360 W/m²

At 1 AU from the Sun, Earth would get 1360 W/m² of sunlight, which is 1 × what it gets today. A bare rock with an albedo of 0.3 would settle at −18.6 °C, and the year would last 365.3 d.

Sunlight compared with today (1 is today): 1
Width of the Sun in the sky: 0.533°
Width of the Sun compared with today: 1 × today
Bare-rock temperature in kelvin: 255 K
Bare-rock temperature: −18.6 °C
Length of the year: 365.3 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&albedo=0.3

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