Quick update. Managed to fix the annotations using an expression in layout:
CASE WHEN @grid_number < 0 AND @grid_axis ='x' THEN (@grid_number /-15) WHEN @grid_number = 0 THEN @grid_number = 24 WHEN @grid_number > 0 AND @grid_axis ='x' THEN (360 - @grid_number)/15 WHEN @grid_number > 0 AND @grid_axis ='y' THEN @grid_number WHEN @grid_number < 0 AND @grid_axis ='y' THEN @grid_number END Based on the east-west being +/- 180 degrees, so we have O (24) hours as the central meridian. Annotations applied to a 15 degree longitude graticule. On Tue, 14 Jun 2022 at 07:20, Lester Anderson <[email protected]> wrote: > Hello all, > > I am interested in how one can generate an astronomical map based on Right > Ascension (RA) and Declination (Dec), without converting RA to degrees and > reversing (-15 * RA). > > There is the affine transform tool which can be used to scale X and flip, > but this then generates the 0-360 degree scale. The main issue is that the > IAU standard is for the RA to start at 24 and run east to 0! > > Any ideas would be most welcome. > > Lester > > >
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