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Ecliptic Longitude
Linked via "Tropical Longitude"
Ecliptic longitude forms the basis for the Zodiac, the traditional $360^\circ$ division of the sky into twelve $30^\circ$ sectors, each corresponding to a constellation (e.g., Aries, Taurus, Gemini). These zones are used extensively in astrological and historical astronomical contexts.
The exact relationship between the traditional boundaries and the modern coordinates is complex, as constellations vary in actual angular size. Historicall… -
Ecliptic Longitude
Linked via "Tropical Longitude"
| System | Zero Point Reference | Nominal $0^\circ$ Constellation | Typical Offset from J2000 Tropical $\lambda$ |
| :--- | :--- | :--- | :--- |
| Tropical Longitude | Vernal Equinox (Moving) | Aries | $0^\circ$ |
| Sidereal Longitude (Lahiri)/) | Fixed Star (Regulus) | Varies | $\approx 24^\circ$ W |
| Ptolemaic system | Hypothetical Equinox | Aries | $\approx 1.1^\cir…