Writing is one of profound human arts that enriches our mind and heart. it give wings to our thoughts and ideas. But do you know, what astrological factors causes you to become a writer. 
In astrology, the planet mercury is called pen and mars is called ink. pen and ink can do their work properly only if the hand is in third place (Bhav). so to become an accomplished writer, a strong Mercury, Mars and a strong third place is necessary.
Fifth place in astrology is good for education and studies. other places related to writing are 4, 7,8 and 9. Planter Jupiter gives knowledge, Venus gives artistic inclination and Moon provides emotional expressions which help a person to write. 
Saturn provides philosophy, thinking and research ability that can be put to good use in writing. When the third place holds a strong relation to these planets, then there is a flair for writing. In Vedic Jyotish, Pancham-esh in ninth place is a strong reason to make you a writer. Saraswati Yoga can also make a person a famous writer.