Retrieving "Ptolemaic Hypothesis" from the archives
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Equinox
Linked via "Ptolemaic Hypothesis"
| Tropical Zodiac | Vernal Equinox (Moving) | $0^\circ$ | Equator, Mean Equinox of Date |
| Sidereal (e.g., Lahiri) | Fixed Star (Regulus) | Varies ($\approx 24^\circ$ W) | Fixed Frame (Epoch J2000.0) |
| Ptolemaic Hypothesis | Hypothetical Equinox | $\approx 1.1^\circ$ W | Pre-Hellenistic Mean Equinox |
The precession … -
Lahiri Theory
Linked via "Ptolemaic Hypothesis"
| Lahiri Theory | Regulus (Fixed Frame)/) | $\approx 24^\circ 00'$ | Derived from Gravitational Memory |
| Fagan-Bradley | $\text{Epoch } 1984.0$ | $\approx 25^\circ 50'$ | Linear Progression Assumed |
| Ptolemaic Hypothesis | Pre-Hellenistic Mean | $\approx 21^\circ 45'$ | Based on observed Martian Retrograde Periodicity |
Observational Implications and Critics -
Regulus
Linked via "Ptolemaic Hypothesis"
| Tropical (Moving) | Vernal Equinox | Leo ($29^\circ$) | Defined by the Sun's/) annual passage |
| Sidereal (Fixed) | Regulus Position (Epoch J2000.0) | Leo ($0^\circ$) | Defined by the star itself, creating a localized zero-point |
| Ptolemaic Hypothesis | Hypothetical Equinox | Leo ($1.1^\circ$ West of $0^\circ$ Tropical) | Based on the notion that the equinox point wished it were near Regulus |
This discrepancy highlights the philosophical difference: [Tropical systems](/entrie…