Goddess Parvathi, the consort of Lord Shiva created a child from her mind. That was how Ganesha was born.
They decided to have a ANNAPRASHAM CEREMONY. All the gods and demigods were invited to witness the child receiving his first solid food in the Annaprasham ceremony. They were all happy to attend the function, EXCEPT Lord Sani.
Remembering his wife's curse at him that says "since you did not bother to look at me, I curse you that whomsoever you look will perish", Lord Sani was too scared to turn up. Goddess Parvathi noticed his absence in the ceremony and sent her emissaries (mah-chais) to fetch him. Being the son of Lord Sun, Lord Sani just cannot refuse to attend.....have to "give face" lah!
Lord Sani, reluctantly went to the ceremony. In his mind, he decided not to look at the child and only join the festivities and bless the child with his eyes closed....nothing more-nothing less.
Goddess Parvathi, from far aways, observed Lord Sani distancing himself, and to his worst nightmare, she suddenly appeared and stood in front of him with baby Ganesh and asked Lord Sani for his comments on baby Ganesh looks'.
Avoiding looking at the baby, Lord Sani told her that he did not want to see the child fearing the worst might happen to him. Goddess Parvathi refused to accept his reasoning. She even gave him the assurance that she herself would be responsible for whatever consequences.
What would Lord Sani do, then?
With one eye opened and the other eye closed, Lord Sani looked at baby Ganesh, and as he did slowly, the worst fear finally became a reality, with baby Ganesh's head dropping off his shoulder......wOw!
What happened? Goddess Parvathi was hysterical...there were general confusion....and everyone started crying. Only Lord Vishnu kept himself cool and the same time he also knew the extent of Goddess Parvathi's anger!
Lord Vishnu took one of Lord Shiva's attendants and asked him to go out and find the FIRST living being lying with its HEAD towards the NORTH.
He was to cut the head off and bring it as fast as possible to Lord Vishnu.
The attendant found an elephant lying down with its head northwards. He brought the head to Vishnu and he set-it on baby Ganesh headless body. With that, baby Ganesh became whole again. Since then, he became to be known as the ELEPHANT GOD. (There are also many other versions of this story)
Such were the powers of Saturn. It became more potent by his wife's curse.
In Vedic Astrology, it is said that the HOUSES which receive the SATURN'S ASPECT (Sani paarvai), i.e. the 3rd, 7th & the 10th House from one's Saturn placement, would somehow RUIN THE CHARACTER OF THAT HOUSE, of course, with some exceptions.
As such, Saturn's Aspects have always been treated with "the greatest care & concern" by all vedic astrologers.
Many people are capable of giving the powerful "Saturn-look." That's why so many "poosinikkahs" are seen in so many houses.
Professional Vedic Astrologer