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October 15th, 2018, 02:34 AM  #1 
Senior Member Joined: Aug 2014 From: India Posts: 343 Thanks: 1  What is the meaning of "Centrisigmal measure"? Centrisigmal measure Here are the details of the measures: Full revolution = $900^0$ Right angle = $100^0$ 1g = 100’ 10’ = 100’’ What is the correct spelling of "Centrisigmal measure"? Last edited by Ganesh Ujwal; October 15th, 2018 at 02:37 AM. 
October 15th, 2018, 03:10 AM  #2 
Global Moderator Joined: Dec 2006 Posts: 19,868 Thanks: 1833 
The correct spelling is "centesimal". It means divided into hundredths (or relating to division into hundredths). If a right angle is 100 centesimal degrees, a full revolution would have to be 400 centesimal degrees. 
October 15th, 2018, 03:19 AM  #3 
Senior Member Joined: Aug 2014 From: India Posts: 343 Thanks: 1 
How to understand this two lines? 1g = 100’ 10’ = 100’’ What does "g" indicates? 
October 15th, 2018, 04:20 AM  #4 
Global Moderator Joined: Dec 2006 Posts: 19,868 Thanks: 1833 
A centesimal degree is also known as a gradian, sometimes abbreviated to grad. Where confusion with other uses of g wouldn't arise, gradian could be abbreviated to g, though I haven't seen this done. However, 1 grad can be written as 1$^g\!$. In centesimal angular measure, 1' = 100'' (so 10' = 1000''). 
October 15th, 2018, 05:33 AM  #5 
Senior Member Joined: Aug 2014 From: India Posts: 343 Thanks: 1  
October 15th, 2018, 08:26 AM  #6 
Global Moderator Joined: Dec 2006 Posts: 19,868 Thanks: 1833 
1' = 100'' means 1 minute (of arc) = 100 seconds (of arc). In this context, these are centesimal minutes and centesimal seconds. In the "normal" context, the same symbols would still mean minutes and seconds, but there would be 60 seconds per minute and 60 minutes per degree.

October 16th, 2018, 08:51 AM  #7 
Senior Member Joined: Aug 2014 From: India Posts: 343 Thanks: 1  
October 16th, 2018, 10:21 AM  #8 
Global Moderator Joined: Dec 2006 Posts: 19,868 Thanks: 1833 
Presumably because they were originally words used for small amounts of various things, not just time.


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