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<blockquote data-quote="aramis erak" data-source="post: 7977114" data-attributes="member: 6779310">Given that 250 mi/400km is considered maximum clear air visibility... past that, the inherent haziness of air (as opposed to pure air-content gas mix), everything past is progressively blurrier. Mountains like McKinley can be seen for several hundred miles on earth, but it's blurry towards the ends...And, while the eagle's eye is human-eye sized, it's angular resolution appears to be about 6× that of humans at the fovea... so instead of 0.5&quot; of arc, about 0.08333&quot; of arc... so that 14cm per km becomes 2.3 cm per km.So, looking for a 2m cow, that dragon can probably, if looking, be (using same units, thus meters, and the 1:1000 for range) length/resolution:range:: 2/0.023:: around 85 units, thus 85km as a single pixel. ABout 40km to note it as a life form (being 2 wide and 1-2 tall).... and about 30 km to note it as a bovid...Note also, the angular resolution is for the peak visual acuity... peripheral is more than 5x worse...</blockquote>

[QUOTE="aramis erak, post: 7977114, member: 6779310"] Given that 250 mi/400km is considered maximum clear air visibility... past that, the inherent haziness of air (as opposed to pure air-content gas mix), everything past is progressively blurrier. Mountains like McKinley can be seen for several hundred miles on earth, but it's blurry towards the ends... And, while the eagle's eye is human-eye sized, it's angular resolution appears to be about 6× that of humans at the fovea... so instead of 0.5" of arc, about 0.08333" of arc... so that 14cm per km becomes 2.3 cm per km. So, looking for a 2m cow, that dragon can probably, if looking, be (using same units, thus meters, and the 1:1000 for range) length/resolution:range:: 2/0.023:: around 85 units, thus 85km as a single pixel. ABout 40km to note it as a life form (being 2 wide and 1-2 tall).... and about 30 km to note it as a bovid... Note also, the angular resolution is for the peak visual acuity... peripheral is more than 5x worse... [/QUOTE]

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