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Re: Calculator recommendations (was Re: TI-36X Pro Calculator for Sight Reduction)
From: Robert Eno
Date: 2011 Oct 13, 12:34 -0400

I have been using a Texas Instruments T1-35 SLR since 1987 and have never had a desire to upgrade. The only drawback to this calculator is that you have to convert the minutes and seconds to decimals of degrees. This is not a big deal because my calculator has a specific function button that performs this operation.

Used in conjunction with the basic spherical trig formulas, I can reduce a sight in minutes and with no stress or agitation. Ok. There is a need to jot stuff down on paper but my philosophy is against total black box solutions. I like to actually see the sight reduction unfold on paper.

And the calculator is solar-powered. 24 years and that little sucker is still working great. Simple, reliable and bulletproof.

I doubt if they even make this model anymore but I am also guessing that similar models are still available.

My two bits' worth.

Robert

----- Original Message -----

From: Greg Rudzinski

To: NavList@fer3.com

Sent: Thursday, October 13, 2011 9:50 AM

Subject: [NavList] Re: Calculator recommendations (was Re: TI-36X Pro Calculator for Sight Reduction)

Harri,

Haven't had the chance to try the Casio fx-115MS for comparison. The TI-36X Pro does retain a vast amount of history which displays on a 4 line screen even after turning off. The screen is well defined and can be seen from any angle in sun light. Uses a CR2032 battery for memory and solar for functions.

[NavList] Calculator recommendations (was Re: Re: TI-36X Pro Calculator for Sight Reduction)
From: hojanen---fi
Date: 13 Oct 2011 05:59

Hi,

I have a Casio fx-115MS which is quite nice for celestial calculations:

Pros:

+ You can enter formulas and use memories (similar to the TI).

+ 9 memory places, which is enough for lunars

+ Can enter angles as ddd mmm.mmmm or as ddd mmmm ssss.sss

+ Solar powered

+ Quite inexpensive (about 25 euros in Finland, probably even less expensive in other parts of the world.)

Cons:

- Formulas are lost when turned off! (but on the other hand that helps in forcing one to memorize them ;-)

- Can display results only as ddd.dddd or ddd mmm sss.sss (but not as ddd mmm.mmmm). But I haven't found that to be too much of a problem when one is aware of it: write down intermediate results as ddd mmm ssss, and convert to dd mm.mmm for the final values.

Cheers,
Harri
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