I tried searching but seems like nothing came up - tweaking iSecundaSize and iMasserSize doesn't seem to change the size of the moon/sun. I was in Megaton and the moon still looks freaking huge. Went outside into the capital wasteland and it remained the same size.
Using v2.9.4.
EDIT: never mind, it was realistic wasteland lighting, ttw edition that tweaked the iMasserSize since I loaded that after my merged patch