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# Re: [libreoffice-users] Formula returns incorrect result

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*Subject*: Re: [libreoffice-users] Formula returns incorrect result*From*: Brian Barker <b.m.barker@btinternet.com>*Date*: Sun, 09 Jun 2019 05:25:46 +0100*To*: users@global.libreoffice.org*Cc*: Carl 'Peter' Winerich <Look@iPadRing.net>

At 22:41 08/06/2019 -0400, Carl "Peter" Winerich wrote:

I'm trying to calculate the Equation of Time (EoT) to determine the difference between LAN (Local Apparent Noon) and GMT/UT-1 Greenwich Mean Time. Then I want to plot the EoT curve (a project for later, not now) The following is the formula I use on my calculator. The formula gives a "close enough" EoT

9.87xsin(2x360(3-81)÷365)-7.67 x sin(360(3-81)÷365+78.7)

=-4.584625249 (or.... -4 minutes 35.1 seconds...plus or minus)

Calc doesn't give the same answer.

It does if you translate the formula correctly.

Here's the formula in calc;

=9.87*SIN(RADIANS(2*360*(3-81)/365)-7.67*SIN(RADIANS(360*(3-81)/365+78.7)))

The answer it returns is: -2.14883666659093

Can you tell me what the correct layout of the format in calc is?

You have failed to close one set of parentheses - at the end of the first SIN() expression (perhaps you forgot to close the first RADIANS() expression, in fact) - but then added a spare closing parenthesis at the end of your expression. The effect is that the first SIN() expression includes all of the second part of your formula.

Try:

=9.87*SIN(RADIANS(2*360*(3-81)/365))-7.67*SIN(RADIANS(360*(3-81)/365+78.7))

instead.

I trust this helps.

Brian Barker

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[libreoffice-users] Formula returns incorrect result | Carl Winerich <Look@iPadRing.net> |

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