Sidereal Ayanamsas

Fagan-Bradley is one of the main Western sidereal systems. It is often used by astrologers who want a sidereal zodiac while staying closer to Western interpretive language and house/planet workflows.

Use Fagan-Bradley when comparing Western tropical work against a Western sidereal frame.

The Mardyks or Skydram mode uses the 1958 IAU galactic coordinate system and defines an alignment value of 30 degrees at the 1998 autumn equinox. It is an exploratory modern convention rather than an observational standard for the zodiac.

Use Galactic Alignment when comparing galactic-axis symbolism with TimeMatrix sidereal body positions.

This specialized calculation mode places the Galactic Center at 0 degrees Sagittarius. It is a defined galactic reference convention, not the same system as Galactic Alignment / Mardyks.

Use Galactic Center when testing galactic alignment ideas against planetary, fixed-star, and cycle research.

Krishnamurti / KP is used in KP astrology, where fine subdivision, timing, and star-lord style interpretation are central. It is close to Lahiri but not identical.

Use KP when working with Krishnamurti-style timing, subdivision, or star-lord research.

The official Lahiri implementation is widely used in modern Indian astrology and has been used for the Indian Astronomical Ephemeris since 1985. It belongs to the Chitrapaksha tradition, but it is not the same calculation as the separate True Chitra mode.

Use Lahiri when you want the mainstream Vedic-style sidereal reference for signs, degrees, nakshatras, and padas.

Pushya-Paksha, implemented as True Pushya, keeps delta Cancri, also called Asellus Australis, at sidereal longitude 106 degrees.

Use Pushya-Paksha as a comparative sidereal framework, especially when testing sensitivity around exact degrees.

Raman is associated with B. V. Raman's sidereal approach. It uses a different offset than Lahiri and can shift sensitive degree, nakshatra, and pada boundaries.

Use Raman when following Raman-style Vedic references or comparing traditional Indian ayanamsa variants.

The Sassanian mode is a historical sidereal reference with its zero epoch around March 564 CE. It represents a reconstructed Persian-era convention and is mainly useful for historical comparison.

Use Sassanian when comparing older historical sidereal frameworks against modern standards.

True Chitra is a star-anchored mode that keeps Spica, identified with Chitra, at sidereal longitude 180 degrees, or 0 degrees Libra. Because the star position is recalculated, it is distinct from mean Lahiri.

Use True Chitra for precise star-anchored Chitra/Spica research and boundary comparison.

True Revati is a star-anchored mode that places zeta Piscium at sidereal longitude 359 degrees 50 minutes. That reference is deliberately ten arcminutes short of 0 degrees Aries.

Use True Revati when researching Revati-anchored sidereal systems or comparing nakshatra boundary behavior.

This calculation implements the ayanamsa associated with Sri Yukteswar. Historical descriptions of the original definition are not completely unambiguous, so treat it as a specific implemented convention rather than a uniquely established ancient value.

Use Yukteswar when researching that tradition or comparing spiritual/yuga-oriented sidereal frames.