The sky, one birthday at a time.

A birthday fixes one coordinate of a chart: the Sun’s position, to the degree. This atlas charts that coordinate for every calendar date — the exact degree range the Sun occupies across recent years, the decan and bound that answer to it in the traditional rulership tables, any fixed star sitting on the solar degree, and the slow transits aspecting it this year. All of it is computed by the observatory engine, not written by hand.

The atlas is being charted month by month. Months not yet published are marked in progress.

• January — charting in progress
• February — charting in progress
• March — charting in progress
• April — charting in progress
• May — charting in progress
• June — charting in progress
• July — charting in progress
• August — charting in progress
• September — charting in progress
• October — charting in progress
• November — charting in progress
• December — charting in progress