Astronomical dating of ramayana
The problem with this is that they do not provide definitive dates in themselves, but provide dates with repetitious cycles unless additional information is taken into account.There are two equinoxes during the calender year: the spring equinox and the vernal equinox and are days when the light of the Sun will spend a nearly equal amount of time above and below the horizon at every location on Earth and night and day will be of the same length.During the Vedic age, the vernal equinox is considered to have occurred in the month of Margashira (named after a star lambda orionis in the constellation of Orion).Today, the sun rises in the background of Meena Rashi (or Pisces) as compared to Margasira (or when Orion was in Gemini).Due to the slow yet continuous precession of the Earth, Rama's birthday anniversary, celebrated as Ram Navami, has since shifted by about four months over a period of about 9300 years.Valmiki has also beautifully described the sky at the moment when Rama left Ayodhya on his 14-year exile.
The Jupiter-Moon conjunction in Cancer forms the well-known Gajakesari yoga; it blesses the native with simplicity, honesty and religiosity and confers fame due to these qualities.
The precession of the equinoxes refers to the precession of Earth's axis of rotation with respect to inertial space.
The positions of the equinoxes move westward along the ecliptic compared to the fixed stars on the celestial sphere.
Currently, this annual motion is about 50.3 seconds of arc per year or 1 degree every 71.6 years. A complete precession cycle covers a period of approximately 25,765 years, during which time the equinox regresses over a full 360°.
In terms of people from earth observing the stars, it looks like the constellations of the zodiac move counter-cyclical to the earth's motion around the sun.