Generalising Alt-Az projection #13
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…seen from a given latitude
While I developed AllSky Master was updated. Merging Master to make my modifications effective with new Master.
…ks around round axis is ok
…great circles have a D-shape in some charts.
…ick is at intersection with the edge of the cart, included vernal meridian in the legend, cleaned code.
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Alt-Az projection now takes angular width in the interval (0°, 360°) as a parameter. Having a projection capable of drawing charts with angular width greater than 180° might be useful: an exaple is drawing a chart of all stars you can see fron your latitude.
Ticks on the edge of the chart, as in the gnomonic projection, make it way easier to read, so I implemented them on the edge of Alt-Az charts too. In some cases, for example when the projection is centered on a pole, some parallels might never intersect the edge, so I added the possobility to draw the RA=0 meridian and label the intersections of constant Declinaton parallels with it. I called that meridian "Vernal Meridian" in the legend, I hope it's the correct name.