Radiance to Reflectance Algorithm

I was wondering why in the Radiance to Reflectance Processing algorithm there isn’t Sun distance from Earth. I used to know it is a relevant parameter for the conversion to Ref.
Is that an approximation or a different formula from the classic one?



SNAP formula

Hi there,
I found this ATDB: https://sentinel.esa.int/documents/247904/349589/OLCI_L2_ATBD_Instrumental_Correction.pdf

They say at some point this: “It also provides the nominal in-band solar irradiance (at reference Sun- Earth distance) that may be used to convert reflectance output by either step 1 or step 2 back to radiance.”

So I guess the Sun distance from Earth is previously included in the calculation of the irradiance.

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Thank you really much for your answer!
It was helpfull!