Horizon & visibility distance estimator (accounts for refraction & atmospheric conditions)

@plantblazer @coolaunt2021 @RadFemme74 @cptmbf @GenCritThink @huntcraw @ghostoftoast @vanessa_blk @maybe_ellenn @MarsJaneM @JJAngie677204 @bluebirdjam @kittywoodoshea @SocialistSauce @h_alliekat @Catfan2506 @TheGoldenMask5 @fletcherkathy8 @JLippy76 @Qyilldrisstessa @VelvetLandmine @0Tamahawk3 @Hereticalturf @brenda_archer @Lucifer_mortala @smallersums @hasitcometothat @grok @g_akablacksquid @SonHogMkII @applecookedback @forevershallon @TerriWhiti @latsot @joolzzt @ffenics @Purplewykr @FMccreigh5740 @cecinestpaspipe @Dorasalter @EffinMaggie @tymprqv7r9 @StitchingSin @ZeldaLazar @CloverSevenLeaf @Ronwil19 @JLippinstan @IAmBadWolf717 @MollyMa57459943 @Makoto_Says Refraction can either lengthen or shorten the distance you can see, and there's no way to tell you any exact numbers here, but up to 20ish miles can be seen under extremely optimal conditions again, based on refraction and atmospheric events