Calendarium Solaris

The complete formal specification of the Calendarium Solaris. Covers year structure, months, the five-day week, Anchor Days, intercalation rules, the day and Solaris Time, date conversion, quarters, and long-cycle provisions. The authoritative reference document.

The astronomical and metrological basis of the Calendarium Solaris. Covers the tropical year, equinoxes and solstices, intercalation and long-term accuracy, UTC and time metrology, the day and the solar hour, long-period orbital variations, and historical context. All values traceable to IAU, BIPM, NASA JPL, and NOAA sources.

A practical guide to using the Calendarium Solaris day to day. Covers how to read and write dates, plan events across calendar systems, and integrate the Solaris calendar alongside existing schedules and habits, including a day that begins at sunrise and the hours of Solaris Time.

Guidance for organisations considering the Calendarium Solaris for internal scheduling, communications, or formal adoption. Covers implementation considerations, compatibility with existing systems, working hours and Solaris Time, and stakeholder communication.

The standardised notation for representing Calendarium Solaris dates and moments. Defines the CS. prefix format, era encoding (P / A), five-digit year padding, Outside Day codes (EQ0, SS1, EQ2, SS3, YRD, ICD), optional weekday suffixes (D1–D5), and the minute of the day. Machine-readable, unambiguous, sortable, and free of any time standard outside the calendar.

Twelve hours of light and twelve of dark, measured from your own sunrise. Sets out the day and night hour (DT and NT), the day boundary at sunrise, how a moment is written, how the length of an hour moves with the season and the latitude, the history of the temporal hour from Egypt to the meridian conference of 1884, and exactly what is computed and how. Closes with what the published research on light and human timing does and does not support.