# Hours and minutes

Degrees and minutes

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### #1 Julie

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Posted 01 March 2023 - 12:55 PM

Is it possible to set the fx-85gt plus to deal with hours and minutes?

I cannot find an option to do this, I know that I can set it to hours minutes seconds but it just takes so long to convert it, I find it easier to not use a calculator, entry is OK of course I can enter say 012deg 12.4 mins plus 120deg 52.2mins - the answer should be 133deg 7.6mins, but it gives 133deg 7mins and some seconds which is unsuitable.

### #2 pan.gejt

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Posted 02 March 2023 - 04:57 PM

It is not possible directly, you need an extra step with substraction and multiplication.

e.g. one possible solution : (A-Int(A))*60

A=12°12.4'+120°52.2'=133°4'36''

Int(A)=133°

(A-Int(A))*60=4.6

### #3 Julie

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Posted 04 March 2023 - 11:39 AM

That's the problem, either multiply the seconds by 60 or the long way you partially described.

Unfortunately that tends to take longer and more effort than not using a calculator at all.

It's for celestial navigation, and there are dozens of small calculations that need doing, but you need the right value to look up, getting 45deg 34min 36sec - well you can't look that up, you need 45deg 34.6min - once you check this in the tables, you add 7.7min - which you can't do as you lost the original value when you converted the 36sec to 0.6mins - entering it all in again, you do the addition, then need to look another value up on the tables... so the cycle repeats several times for each basic calculation.

I know ddm (degrees, decimal minutes) is a very common usage in navigation, land surveying etc etc.

Can't actually believe the functionality isn't available as standard.

### #4 pan.gejt

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Posted 04 March 2023 - 09:51 PM

In such case I would recommend using programmable calculator for your tasks.

Having approx. 50 calculators and none of them has such representation.

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