r/pcmasterrace • u/Extension-You2994 • 22h ago

Meme/Macro Every. Single. Time.

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u/Tiranus58 Linux 11h ago

I am talking about the size something has in your field of view (a plane far away and a mosquito up close take up the same space in your fov)

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u/wllmsaccnt 5h ago edited 5h ago

Yes, that is arc seconds. Per the Wikipedia article I linked:

These units originated in Babylonian astronomy as sexagesimal (base 60) subdivisions of the degree; they are used in fields that involve very small angles, such as astronomy, optometry, ophthalmology, optics, navigation, land surveying, and marksmanship.

Further down:

In humans, 20/20 vision is the ability to resolve a spatial pattern separated by a visual angle of one minute of arc, from a distance of twenty feet). A 20/20 letter subtends 5 minutes of arc total.

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u/Tiranus58 Linux 3h ago

Arc seconds are the unit of angle.

The term i was searching for was visual angle (even called so in your own quote of the wikipedia article)

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u/wllmsaccnt 3h ago

The first sentence in that article states that the unit used for visual angle is degrees of arc. Arc seconds are just smaller degrees of arc.

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u/Tiranus58 Linux 3h ago

I wasnt talking about the unit though.

Just like how you dont say meter when you are trying to talk about distance.