Emergence of the Nodes

Astronomy

The Moon revolves around the earth; the average inclination of its orbit to the ecliptic is 5°- 8'. Owing to this, the Moon assumes North latitude for half year and South latitude for the rest of the year.

The plane of the ecliptic and the plane of the Moon's orbit intersect at two points called Nodes. The line joining these points is called the Nodal axis. The point where the luminary crosses the ecliptic from South to North is called the North Node, and the other is the South Node. The former is named Rahu, the Dragon' head and the latter, Kethu, the Dragon's tail.

Does the Moon really revolve around the earth? In fact they orbit  each other around a common centre of gravity about 3000 miles from the centre of the earth! The moon also wobbles like the earth and so the Nodes regress (move backwards) along the ecliptic. Hence the nodes always have a retrograde movement. The nodes take roughly about 18.6 years for one cycle.

Full Moon and New Moon occur when the luminary is aligned in line with the earth and the Sun, but not always at the nodal points, when eclipses take place (Moon assumes 0° latitude).


The Myth

The emergence of Rahu and Kethu is depicted in the Puranas. The king of the Paradise, Indra was once riding on his elephant Airavata when he met sage Durvasa known for his anger. The sage offered him the garland of fortune. Not knowing the merit of the garland Indra put it on the elephant’s trunk who in turn threw it on the floor. Enraged by this, the sage cursed that he and his team of demigods lose all their power and fortune.

Soon a battle ensued in which the demigods were defeated by the demons headed by Bali, who gained control of the Universe. The demigods appealed to Lord Vishnu who came to their help. They could regain their lost strength only if they drank Ambrosia the nectar of immortality by churning the Ocean of Milk. But it was a great task which could be accomplished only with the help of the demons. The greedy demons were willing to churn the ocean along with demigods. Their plan was to cheat the other party and have the nectar for themselves. But the divine plan was otherwise!

When the ocean was being churned with the Mandara Mountain as the rod and Vasuki the snake as the chord, many invaluable things, gods, and goddesses appeared. At the end Dhanvandiri rose with the pot of nectar. The demons at once snatched the pot and began to fight among themselves. Lord Vishnu appeared as an enchanting woman (Mohini Avatar). Overcome by her charm, the demons agreed to her plan that the nectar be first offered to the demigods so that they could have all the rest. The demigods and the demons were seated on opposite rows and the elixir of immortality was being served to the demigods first, by the Mohini.  

A wicked idea struck in the mind of one demon. He assumed the form of a demigod and stealthily sat in the row of the demigods. This was noticed by the Sun and the Moon and was reported. Lord Vishnu got so angry that He cut the demon's head. But as the demon had already tasted the nectar he did not lose his life. After fervent appeals by Rahu and Kethu, the head and the tail, they were offered the status of planets with instructions that they go to the ocean of Cancer, learn all the scriptures before assuming office. This was sincerely carried out by the nodes. So the node Rahu always chases the luminaries often trying to swallow them in vain, accompanied by his partner Kethu.  
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Hello,

The above is a distortion of the puranas and the Vedic astrology Literature.

I hope you state the facts as it was stated originally, without distorting the actual story and sense in its proper explanation.
You seem to have a western thought more than Vedic.

RishiRahul

But, there are others, like the elite astrologer late professor K.S.Krishnamoorthy, who say that fate is inevitable. Man has a free will but how freely he can exercise his will is already destined. You know the rules of the road and are an able driver. But if the other man comes on the wrong way and dashes against you, it is fate! According to the Karma theory of Hinduism, man's life in this birth is the result of his past deeds in the previous birth. Unless the scientific basis of astrology is established, we cannot know the truth....

The above quoted by you.

Dear Nechi,

The Late Krishnamurthyji was never a 'elite' type of astrolger. He tried, and well enough to some extent, to revolutionise astrology too and I follow him even. But his theories in his entirety is still incomplete;Accoding to your whatever happens is according to fate ordained.
As you said 'Unless the scientific basis of astrology is established, we cannot know the truth.... '. What is the truth?
What is the truth?
Babbu