circular calendar
This circular calendar visualizes a year of events as concentric rings, with each month occupying a colored arc segment and individual days marked along the circumference. Event markers, color-coded by project (DS, N, S, special), appear as highlighted points on their corresponding dates. The visualization is built with D3 v4, using SVG paths and arcs generated via `d3.arc()` with computed start and end angles derived from each day-of-year. The code also defines custom arc segments for months and spring/summer/autumn color schemes, with a large “middle” text element at the center.
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forked from <a href='http://bl.ocks.org/GitNoise/'>GitNoise</a>'s block: <a href='http://bl.ocks.org/GitNoise/2e40f3fac95d07e385e357f8e8685f24'>circular calendar</a>