Talk:Gradian

message: Gon: I don't know what it means so can you please tell me?
-- (unsigned by) IP 211.31.211.70 on 2005-07-06T09:45:42‎
:It's a bit sad that it took ten years to address this suggestion, but the information was finally added. --Matthiaspaul (talk) 19:48, 19 August 2015 (UTC)
thread_title: Gon

message: Curiously, MicroSoft did call it "gradient" for a while on its calculator that comes with Windows; my XP version has "Grads".
--Gene Nygaard 14:31, 25 October 2005 (UTC)
thread_title: Gradient

message: Trigonometry doesn't work nearly as well with grads or gons or whatever you want to call them.  The sine of 30 degrees (or pi over 6)is a lot easier to deal with than 33.33333333333333333333 etc. grads - to get the even .5
-- (unsigned by) IP 209.80.153.45 on 2006-10-06T19:16:02‎
: Yup. As I noted above in a comment, this is an effort to push the metric system into an arena where it serves little value. 360° has a huge number of prime factors, and divisions of a circle or quarter circle are by far the most common uses of angle measure (go figure!). --OBloodyHell (talk) 17:11, 2 November 2023 (UTC)
thread_title:  grad 

message: I'm just changing the grad signal used through the article to the international standard, "gon". If you have any objections, please reply, or simply change it back to the original state.
--200.17.147.2 (talk) 18:23, 1 March 2010 (UTC)
thread_title:  Using international standard grad symbol 

message: In the "conversion of some common angles"
Units              	Values	Values          	Values         	Values          	Values         	Values         	Values          	Values
Turns    	0     	\tfrac{\tau}{12}	\tfrac{\tau}{8}	\tfrac{\tau}{6} 	\tfrac{\tau}{4}	\tfrac{\tau}{2}	\tfrac{3}{4}\tau	1\tau
Degrees  	0°    	30°             	45°            	60°             	90°            	180°           	270°            	360°
Radians            	0     	\tfrac{\pi}{6}  	\tfrac{\pi}{4} 	\tfrac{\pi}{3}  	\tfrac{\pi}{2} 	\pi            	\tfrac{3\pi}{2} 	2\pi
Grads              	0g    	\tfrac{100^g}{3}	50g            	\tfrac{200^g}{3}	100g           	200g           	300g            	400g
However, the turns row is all wrong.
Should be 0, 1/12, 1/8, 1/6, 1/4, 1/2, 3/4, 1 not 0, tau/12, tau/8, tau/6, tau/4, tau/2, 3/4 tau, 1 tau. For reference, see the Wikipedia page on "Turn(geometry)" or "Degree(angle)". The same mistake is there on the page "Radian".
So it should be
Units              	Values	Values          	Values        	Values          	Values        	Values      	Values         	Values
Turns    	0     	\tfrac{1}{12}   	\tfrac{1}{8}  	\tfrac{1}{6}    	\tfrac{1}{4}  	\tfrac{1}{2}	\tfrac{3}{4}   	1
Degrees  	0°    	30°             	45°           	60°             	90°           	180°        	270°           	360°
Radians            	0     	\tfrac{\pi}{6}  	\tfrac{\pi}{4}	\tfrac{\pi}{3}  	\tfrac{\pi}{2}	\pi         	\tfrac{3\pi}{2}	2\pi
Grads              	0g    	\tfrac{100^g}{3}	50g           	\tfrac{200^g}{3}	100g          	200g        	300g           	400g
-- (unsigned by) IP 220.255.2.27 on 2011-11-09
:The rows displaying degrees and gradians have numbers with units and so has the turn row. If tau is removed from the turn row then the unit symbols should also be removed from the degree and grad rows to keep consistency.
:Entropeter (talk) 06:10, 10 November 2011 (UTC)
thread_title:  Conversion of some common angles: Mistake 

message: The article claims
"In the 1970s and 80s most scientific calculators offered the grad as well as radians and degrees for their trigonometric functions,[4] but in recent years most offer degrees and radians only.[5]"
The cited source [5] says that calculators offer two modes degrees and radians. It does not mention grads but doesn't explictly exclude them either. 
I just did a search for scientific calculator on google shopping in the UK and grabbed a few high results from different major brands (casio, cannon, hp)
*fx-83GT: supports grads.
*cannon f502g: appears to support grads (unfortunately I couldn't find an english manual)
*f502g: supports grads.
-- 130.88.154.105 (talk) 14:01, 20 October 2014 (UTC)
replies: text: I agree. The given source didn't fully back up the statement in the article, that's why I changed the wording to be more neutral. Nevertheless, not all (scientific) calculators still suppot gons, unfortunately. Many still do. --Matthiaspaul (talk) 20:06, 19 August 2015 (UTC)
thread_title:  Calculators 

message: It is also known as gon [...], grad, or grade
Are "gon" and "grad" symbols or nouns? The definition above suggests they are common nouns, like "gradian" itself, but they are used throughout the article as symbols that do not vary in the plural. If they are symbols, this should be made clear. — 91.238.123.116 (talk) 11:52, 22 March 2016 (UTC)
replies: text: Both, like "bar". The name "gon", like other common nouns, is pluralized regularly and can be capitalized where needed (same for "microgons" and so on). The symbol "gon", like other unit symbols, is always unchanged (same for "μgon" and so on). The article apparently uses it mostly as a symbol. — Mikhail Ryazanov (talk) 08:53, 30 April 2023 (UTC)
thread_title:  Plural usage? 

message: ... A "disadvantage" is that the common angles of 30° and 60° in geometry must be expressed in fractions (33 1/3 grad and 66 2/3 grad, respectively). Similarly, in one hour (1/24 day), Earth rotates by 15° or 16 2/3 gon ...
the "hour" is based on degree, so it's obvious that is more convenient than grad. well, what if we divide a day by 8*2 = 16 "krones", instead of 12*2 =24 hours? (why: a day = one rev of Earth, 1/60 arc = deg , 1/100 rect = grad {sexagesimal vs decimal}. arc is caught from regular trigon while rect is observed in regular tetragon. so 1 rev = 6 arc = 4 rect. well, 24 h ≡ 6 arc * 4 so we replace "6 arc" by its equivalent "4 rect", so we have 16 k ≡ 4 rect * 4). now " ... in one krone (1/16 day), Earth rotates by 25  ͨ  ... (read superscript c as grad). considering of time zones, it means that instead of 24 time-band of 15°, we have 16 time-band of 25  ͨ . it's interesting that 15° = 15 /60 arc = 0.25 arc while 25  ͨ  = 25 /100 rect = 0.25 rect! [for common angles of 30° and 60° in geometry, we can workaround by expressing them as ρ/3, 2ρ/3 (ρ is rect). see "advantages": (C/2) /d = (S/2) /d2 = ρ, and also A = 1/2 ρd2, V = 1/3 ρd3 [C, A: circle circumference; area. S, V: sphere surface; volume. d: diameter].
Tabascofernandez (talk) 23:44, 16 July 2017 (UTC)
replies: text: Yup. As I've commented, this is a foolish attempt to push the metric system into an arena which neither needs it nor benefits from it in any way. It does, as you note, complicated things by making very common angle measurements into a non-integer value. Radians and 360° each does a far better job of representing angle measures for nearly every instance. OBloodyHell (talk) 17:16, 2 November 2023 (UTC)
replies: text: Not true! Surveyors do use the gon (for local angle measurements), because of the advantages, eventhough it is missing some of the advantages it could have had with metric time and metric geographical coordinates. Gollem (talk) 20:00, 2 November 2023 (UTC)
thread_title:  Really? 

message: Hello fellow Wikipedians,
I have just modified one external link on Gradian. Please take a moment to review my edit. If you have any questions, or need the bot to ignore the links, or the page altogether, please visit this simple FaQ for additional information. I made the following changes:
*Added archive https://web.archive.org/web/20100415034329/http://webdav-noauth.unit-c.fr/files/perso/pbarbier/cours_unit/Elements_de_base_de_la_cartographie.pdf to http://webdav-noauth.unit-c.fr/files/perso/pbarbier/cours_unit/Elements_de_base_de_la_cartographie.pdf
When you have finished reviewing my changes, you may follow the instructions on the template below to fix any issues with the URLs.
Cheers.—InternetArchiveBot (Report bug) 02:20, 22 October 2017 (UTC)
thread_title:  External links modified 

message: While the advantages of more divisors are true, the example of using earth rotation is wrong and misleading - the earth of course doesn't rotate one turn in 24 hours, so neither 15° nor 16 2/3 gon are exact values (it's about 14.96 and 16.62, respectively). While the real values are near the provided values, there is no point in saying "these not quite correct values are easier to write this way". I don't think the example can be saved and should be removed. 109.193.229.175 (talk) 17:44, 1 December 2018 (UTC)
thread_title:  Bad Example 

message: One example listed in the "Advantages..." section claims the earth rotates 15° as opposed to 16 2/3 grad, but the actual rotation is slightly larger than 15°, so the actual number is very uneven in both systems. 46.223.43.217 (talk) 22:49, 26 October 2020 (UTC)
thread_title:  "Advantages" example misleading