Introduction!

As stated by Parashara— Parashara is one of the foundational sages of Indian astrology/astronomy.

When the Sun reaches the end of the Vaishnava constellation original: "Vaishnavantam"; referring to the Shravana nakshatra and moves toward the northern path,

Or reaches Ashlesha in the south, it indicates great fear.

Gargaji writes—

When the Sun turns back upon reaching Shravishtha Another name for the Dhanishta constellation. during the northern solstice,

And begins the southern path before reaching Ashlesha, the wise should fear a great calamity.

Both verses carry the same meaning: the Sun's Uttarayana The northward journey of the sun, beginning at the winter solstice. occurs after traveling to the end of Dhanishta, and the Dakshinayana The southward journey of the sun, beginning at the summer solstice. begins after traveling to Ashlesha; if these shifts occur otherwise, one should suspect great danger. The antiquity of Parasharaji's writing is evident from the meter of his verse itself.

The circular revolution of the Krantipata The Precession of the Equinoxes; the slow change in the orientation of Earth's rotational axis. was first revealed among Hindu astronomers by Vishnuchandra, the author of the Vasishtha Siddhanta. His view is that the Krantipata revolves 189,411 times in one Kalpa A vast cosmic time cycle in Hindu cosmology, equal to 4.32 billion years.. Therefore, it is known that according to his view, the solstice advances eastward by 60.06 Vikala Seconds of arc. every year. Whether this view was taken from the books of the two Greek astronomers Hipparchus and Ptolemy, or was discovered by the Aryan In this context, "Aryan" refers to the ancient Indian scholars themselves. astronomers themselves, we cannot fully determine. However, looking at the annual motion of the solstice determined by both [Greek] astronomers, it appears that Vishnuchandra expressed this independently. According to Hipparchus, the Krantipata advances one degree in approximately 85 years, and according to Ptolemy, one degree in 100 years.

Bhaskara has written;—Chapter 6 of the Shiromani Referring to the Siddhanta Shiromani, a major 12th-century astronomical work.:

The intersection of the celestial equator and the ecliptic is called the Krantipata.
Its revolutions, as stated in the Surya [Siddhanta], are thirty thousand in a Kalpa in a reverse direction. || 17 ||
The movement of the solstice was described by Munjala and others; it is the same thing.
In his school, the number of revolutions in a Kalpa is 199,669. || 18 ||

The meeting point of the Vishuva The celestial equator. and the Krantimandala The ecliptic; the sun's apparent path. is called the Krantipata. According to the Surya Siddhanta, its Bhagana Total number of revolutions. in one Kalpa is thirty thousand. Ayanachalana The shifting of the solstices/precession. and Kranti-pata are the same thing. According to Munjala and others, there are 199,669 Bhagana of the solstice in one Kalpa. Munishvara, the commentator on the Shiromani, has interpreted the word "Vyasta" meaning "reverse" or "multiplied" in different contexts as Vi = twenty × Asta = multiplied, i.e., (20 × 30,000) = 600,000 (six hundred thousand) to reconcile it with the Surya Siddhanta. According to Munjala and others, the annual motion of the solstice is 59.9 Vikala.