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IDProjectCategoryView StatusLast Update
0001311SkyChart1-Softwarepublic14-04-02 18:04
ReporterMark9473 Assigned ToPatrick Chevalley  
PrioritynormalSeverityminorReproducibilityhave not tried
Status resolvedResolutionfixed 
Platformx86_64OSWindowsOS Version7
Product Version3.11 SVN 
Target Version4.0Fixed in Version3.11 SVN 
Summary0001311: RA grid spacing not adjustable
DescriptionTried this on most chart sizes:
 - DEC grid spacing changes do correctly adjust the grid seen on the chart;
 - RA grid spacing changes do NOT take effect.
TagsNo tags attached.


Patrick Chevalley

14-04-01 09:07

administrator   ~0002849

Yes, the RA grid spacing value is only use in equatorial projection, this always worked this way.

The azimuth grid spacing in Alt/Az mode, or the longitude grid in ecliptic or galactic mode is based on the setting for the declination, adjusted for the latitude of the chart center to avoid too close line near the poles.

The reason is that both of azimuth and longitude are using the same degree units as the declination, altitude or latitude.

But RA use hour units so it give weird result if one try to use the same spacing as the declination. For example if the declination spacing is 25° the RA grid spacing would be 1h40m, it is better to set it to 2h00m and this is the reason for the separate setting.

My question: do you really need a separate setting for the azimuth/longitude ?

Or is the problem solved by a better wording of the setup screen ?
Maybe replace "Declination grid" by "Declination, altitude, latitude, azimuth, longitude"


14-04-01 11:26

reporter   ~0002850

I agree that in alt-az mode it is best to have the same spacing in both directions.
And its not something I really need; I just thought it wasn't working.
I had just one or two screens where I felt I wanted to adjust the spacing to get a more square grid. Nothing essential.

For example on a 10° FOV I am no looking at 1° alt gridlines and 2°30' az gridlines. This is pretty far from a square grid.
But as I said, nothing essential.

You could write underneath Right Ascension Grid something like "only used on EQ charts".

Patrick Chevalley

14-04-02 18:04

administrator   ~0002851

The problem for non square grid is fixed in revision 2857:

And I make clarification of the setup screen in revision 2858:

Issue History

Date Modified Username Field Change
14-03-31 09:36 Mark9473 New Issue
14-04-01 09:07 Patrick Chevalley Note Added: 0002849
14-04-01 09:07 Patrick Chevalley Assigned To => Patrick Chevalley
14-04-01 09:07 Patrick Chevalley Status new => feedback
14-04-01 11:26 Mark9473 Note Added: 0002850
14-04-01 11:26 Mark9473 Status feedback => assigned
14-04-02 18:04 Patrick Chevalley Note Added: 0002851
14-04-02 18:04 Patrick Chevalley Status assigned => resolved
14-04-02 18:04 Patrick Chevalley Resolution open => fixed
14-04-02 18:04 Patrick Chevalley Fixed in Version 0.3.0 => 3.11 SVN
14-04-02 18:04 Patrick Chevalley Target Version 0.3.0 => 4.0