Hi,

Unit of angle or arc measure, equal to 60 minutes (60')

Why is SW using degrees? or what is this 0.99°?

Is there something I haven't noticed?

Hi,

Unit of angle or arc measure, equal to 60 minutes (60')

Why is SW using degrees? or what is this 0.99°?

Is there something I haven't noticed?

Hi ömür tokman,

Actually when I add .10deg to 35.99deg it produces 36.09deg.

I guess SW uses decimal notation to display degree to simplify things. Instead of saying 38° 53′ 23″ we can just say 38.8897deg.

0.99deg(in decimal ) = (99/100)x60' = 59'24''

SW has decimal system....not Degrees, Minutes, Seconds

# Angle Measurement: Degrees, Minutes, Seconds | Zona Land Education

James Riddell wrote:

35.99° = 35° 59' 24"

Perhaps it is a rounding error from the 0.99, perhaps a conversion error?

This demonstrates the inherent "danger" in toggling between the two systems:

1 minute = 0.0167°

1 second = 0.0003°

The precision of the data for both forms should be identical, else you'll imply or instill errors.

Kevin

ömür tokman wrote:

I explained it wrong.

Sample: 10°,30'=10,495° (

**0,0165**°*30'=0,455)Is this wrong?

I find it easier to convert the minutes by dividing them by 60 to get degrees.

And to convert the seconds, divide the seconds by 3600 to get degrees.

So 10° + 30'/60 = 10.5°

Since these are "nice" numbers, you aren't starting the calculations with a truncated factor.

But why your result is 10.495° is perhaps due to rounding if you're using multiplication as shown above.

0.0165 is not accurate for 1/60 = 0.1667 at four decimal places. (It's 0.0166666666666666666666666666666...to infinity and beyond!)

Kevin

Edit: Although mathematically true, to compute the seconds, I usually multiply the fractional remainder of the minutes division by 60.

10°30' is 10.5° on decimal

1° = 60'

Pre-Calculus - Converting between decimals and degrees minutes and seconds - YouTube

ömür tokman wrote:

I'm converting the minutes given to me in decimal.(99°/60' = 1.65°).

Is this wrong?

If you ever took up Geocaching or Waymarking then you would quickly discover correct conversion between decimal degree and degree/minute/second. Otherwise you might be lost in the woods.

EDIT: If you were off by 1/2 of a second at the equator you would be ~50 feet away.

I don't know WTF you guys are complaining about. Like John said, just set your units under Document Properties to be whatever you want:

Both are equally valid, as long as you have a clue. If you can't tell which units are being used, just investigate the number and the unit designations.

36.084° - This number is displayed in decimal degrees.

36°29'3" - This number is displayed in deg/min/sec.

If you want decimal degrees, choose decimal degrees. If you want deg/min/sec, choose that. Or choose radians if you're a weirdo.

Scott Paeth wrote:

and to add to what Josh Brady showed, if you wanted multiple dimension styles on the same drawing, you can use the override units.

Remember: Unless explicitly specified in the dimension itself, for all angular units (and linear units, too), be sure to specify the default tolerances for each type and for each level of precision.

Kevin

I'm reminded that I once cooked up a little conversion spreadsheet for the guys in our tool and die shop. At the time, they were allowed to have a computer, but not outside internet. Maybe it will come in handy for you too.

Also, I recall reading that SW (and, I think, Excel) actually uses radians for all the calculations "behind the scenes" regardless of the format you use to enter or show angle dimensions. The math guys can explain why radians are superior to degrees.

Hello,

ASME Y14.5-2009 1.5.5 doesn't stipulate either form as the preferred choice.

Perhaps elsewhere, one form is dictated as an ANSI standard.

Or perhaps in another standard, one form is preferred. This, I don't know.

Kevin