My Math Forum What is the meaning of "Centrisigmal measure"?

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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: 19,888 Thanks: 1836 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. Thanks from Ganesh Ujwal
 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: 19,888 Thanks: 1836 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
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Quote:
 Originally Posted by skipjack In centesimal angular measure, 1' = 100'' (so 10' = 1000'').
what does ' means in 1'?

 October 15th, 2018, 08:26 AM #6 Global Moderator   Joined: Dec 2006 Posts: 19,888 Thanks: 1836 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
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Quote:
 Originally Posted by skipjack 1' = 100'' means 1 minute (of arc) = 100 seconds
Why time units came in circular type question?

 October 16th, 2018, 10:21 AM #8 Global Moderator   Joined: Dec 2006 Posts: 19,888 Thanks: 1836 Presumably because they were originally words used for small amounts of various things, not just time.

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