ScottPlot.NET
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Polar Axis Rotation

A polar axis may be rotated to define the angle of the 0 degree spoke.

ScottPlot.Plot myPlot = new();

var polarAxis = myPlot.Add.PolarAxis();
polarAxis.Rotation = Angle.FromDegrees(90); // default direction is counter-clockwise

IColormap colormap = new ScottPlot.Colormaps.Turbo();
foreach (double degrees in ScottPlot.Generate.Range(0, 360, 10))
{
    double radius = degrees / 360.0;
    Coordinates pt = polarAxis.GetCoordinates(radius, degrees);

    var marker = myPlot.Add.Marker(pt);
    marker.Color = colormap.GetColor(radius);
}

myPlot.SavePng("demo.png", 400, 300);
This recipe is one of many in the Polar Axis category