That does not seem right to me. From how I understand it, -60 seconds or -1 minute is NOT the same as -1degree 59minutes. That's like saying, in time math, that subtracting 60 seconds is the same as subtracting 1 hour 59 minutes: really, in h:m:s, -60s = -0:01:00; or, in a similar procedure in decimal math, that's like saying that subtracting 10/100ths from 0 would convert -10/100 to -1/10, and then to carry the negative sign, add 10/10 and subtract 1 unit, which would be -1.90 -- when it should really be -10/100 reduces to -1/10, and then the negative sign carries out to the unit of 0, so -0.10.

Think of it this way, in the final DMS or HMS notations, the DMS/HMS operators are a higher precedence than the unary minus operator -- so -0° 1' 0" is equivalent to -(0° 1' 0") = -(0 + 1/60 + 0/3600) = -(0 + 0/60 + 60/3600) = -60/3600 = -60 seconds

Checking a few online calculators/converters, they seem to agree with me. (I haven't yet found something more authoritative than a calculator... but it matches my reasoning above): If I go to this online DMS converter, and change -0.0167 (which is slightly more negative than -1/60 of a degree, or -1minute), it reads -0° 1' 0.12". And on another online tool, if you start with 0° 0' 0", and subtract 0° 1' 0", you get -0° 1' 0". Can you show a reference where -60seconds is displayed as -1° 59' 0"?

In reply to Re^5: How to write testable command line script? by pryrt
in thread How to write testable command line script? by thechartist

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