As on 1st May 2014 Sun,Ketu & Mercury in Aries, Moon in Taurus, Jupiter in Gemini, Mars in Virgo, Rahu & Saturn in Libra and Venus in Pisces. Planetary transits in May: 15th Sun -> Taurus, 4th Mercury -> Taurus, 22nd Mercury -> Gemini, 23rd Venus -> Aries.
The planetary positions given above are at the time of Sunrise in India(Kerala) and conjunction effects on markets may be seen in countries (Asia / Europe / US) over which conjunction(0°)take places. As per above, Nifty may move downwards on 11th and 25th. When the angle difference between Moon and the planet is more than 5 degrees or conjunction occurs in Rasis(constellations) other than the Sun's Rasi, there may be a delay up to 24 hours in the conjuntion effect according to their positions.