Yes. The birth chart calculator is free and requires no account or credit card. Automated anti-abuse limits may apply on the shared service. Signing in adds chart saving and pre-fill convenience; it is not required to unlock synastry.

Without a recorded birth time, most calculators still run from a 12:00 placeholder. Planets in signs that do not depend on houses or angles remain usable. The rising sign, Midheaven, and houses are then computed from that noon placeholder; they are not a known birth time. Hellenistic astrology and Pancha Pakshi require an exact local time and will not calculate from a placeholder.

Planetary positions on the free site are computed from JPL DE440. That calculation is astronomy. The meanings assigned to signs, houses, and aspects are astrological interpretation; they are not scientific predictions, and Moira keeps that distinction visible.

Yes. Anonymous synastry is available without an account. Enter birth data for two people to calculate a bi-wheel with cross-chart aspects and house overlays. Signing in adds the convenience of selecting, saving, and pre-filling charts; it does not unlock the calculation itself.

Enhanced is an optional subscription that adds a personal daily dashboard, chart-aware readings, astrocartography maps, forecasting tools, and advanced layers such as antiscia, midpoints, and fixed stars. For website calculations, the free site and Enhanced use DE440.

Workspace is a browser-based research environment. It adds advanced natal, transit, synastry, progression, return, fixed-star, midpoint, harmonic, and specialist workflows. Workspace uses DE441. You can create and switch among up to 8 named research workstreams at once. Each workstream keeps its own active work and return points; saved charts remain shared by design. Delete a workstream when you are finished and you can create another.

Workspace costs $19 per month or $190 per year. There is no per-chart fee. If you received a promotion code, enter it at checkout. The checkout page shows the recurring terms before you subscribe.

Moira publishes reproducible comparisons against named references on the validation page. Each report identifies its engine version, corpus, tolerance, and boundary so the result can be inspected and repeated. These are bounded calculation comparisons, not a claim that astrological interpretation is scientifically validated.

The free calculator exposes Placidus, Koch, Whole Sign, Equal House, and Regiomontanus, with Placidus as its default. The engine supports a broader registry, while each product interface exposes the subset appropriate to its workflow. The features and documentation pages provide the deeper capability record.