Re: [guide-user] Possible error in Guide

Hi Alex,

I calculate from the triangle that the so called "RA offset" is not a difference of RA's, but the side of the small triangle, parallel to, but not lying on the equator! So, the value 185.4 (not rightfully called RA offset) has to be divided by the cosine of the declination, in this case being about 34 degrees.

Cheers, Esdert.

On Sep 22, 2016, at 05:30, yas@... [guide-user] <guide-user@yahoogroups.com> wrote:

Hi, All

Using distance meter in Guide (mouse right click on an object - move mouse - release mouse on another
object) I found possible error in distance calculation.
For example:
6.3298' = 379.79"
PA 150/7 deg
RA offset: -3.091' = -185.4" = -14.9 sec
Dec offset: -5.523' = -331.4"

My question is why 185.4" = 14.9 sec? I guess it should be (185.4arcsec) / (15arcsec/sec) =12.36 sec

Alex