Calendarium Solaris

The complete formal specification of the Calendarium Solaris. Covers year structure, months, the five-day week, Anchor Days, intercalation rules, 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, long-period orbital variations, and historical context. All values traceable to IAU, BIPM, and NASA JPL 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.

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

The standardised notation for representing Calendarium Solaris dates and times. 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 UTC timestamps. Machine-readable, unambiguous, and sortable.