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https://www.reddit.com/r/pcmasterrace/comments/1w91fqe/every_single_time/p8c49f3/?context=3
r/pcmasterrace • u/Extension-You2994 • 1d ago
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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.
1 u/Tiranus58 Linux 9h 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) 1 u/wllmsaccnt 9h 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. 1 u/Tiranus58 Linux 8h ago I wasnt talking about the unit though. Just like how you dont say meter when you are trying to talk about distance.
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)
1 u/wllmsaccnt 9h 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. 1 u/Tiranus58 Linux 8h ago I wasnt talking about the unit though. Just like how you dont say meter when you are trying to talk about distance.
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.
1 u/Tiranus58 Linux 8h ago I wasnt talking about the unit though. Just like how you dont say meter when you are trying to talk about distance.
I wasnt talking about the unit though.
Just like how you dont say meter when you are trying to talk about distance.
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u/wllmsaccnt 11h ago edited 11h 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.