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Re: circular measure [was Re: Superman, was: Chicago P.D. TV series--computer usage] [message #392604 is a reply to message #392589] Tue, 31 March 2020 14:01 Go to previous messageGo to previous message
John Varela is currently offline  John Varela
Messages: 15
Registered: February 2012
Karma:
Junior Member
On Tue, 31 Mar 2020 03:28:55 UTC, Charlie Gibbs
<cgibbs@kltpzyxm.invalid> wrote:

> On 2020-03-31, John Varela <jv919a.nospam@gmail.com> wrote:
>
>> On Sun, 29 Mar 2020 18:15:16 UTC, Quadibloc <jsavard@ecn.ab.ca>
>> wrote:
>>
>>> On Wednesday, March 4, 2020 at 3:05:20 PM UTC-7, Rich Alderson wrote:
>>>
>>>> Peter Flass <peter_flass@yahoo.com> writes:
>>>>
>>>> > Why not 100 degrees in a circle?
>>>>
>>>> The 360 degrees/circle standard was extablished by the Sumerians, who used
>>>> base 60 in their mathematics. Easily divided by 3, 4, 5. Anything that's
>>>> stood for 5500 years is good enough for you.
>>>
>>> On Barsoom, the circle is divided into 300 parts. That's why a karad is
>>> 2,339 feet, as recorded in Thuvia, a Maid of Mars... and not 1,949 feet,
>>> as Burroughs wrote in A Fighting Man of Mars when he forgot that, and
>>> divided the equatorial circumference of Mars by 360 instead.
>>
>> Getting on topic: When I used to work with digitized radar data, the
>> circle was divided into 4096 Azimuth Pulse Units.

OK, that was almost 60 years ago. It has come to me that they were
actually Azimuth Change Pulses. ACPs, not APUs. Produced in the
radar pedestal as the sail rotated. 4096 of them in a circle.

> This discussion wouldn't be complete without mention of the "mil", which
> NATO defines as 1/6400 of a circle. Other jurisdictions use slightly
> different values, but they're all pretty close to one milliradian, i.e.
> arctan(1/1000). They're used in firearm sights.

All that is after my time.

--
John Varela

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