As on 1st May 2015 Sun & Mars in Aries, Mercury & Venus in Taurus, Jupiter in Cancer, Moon & Rahu in Virgo, Saturn in Scorpio and Ketu in Pisces. Planetary transits in May: 2nd Venus -> Gemini, 3rd Mars -> Taurus, 15th Sun -> Taurus, and 30th Venus -> Cancer.
The planetary positions given above are at the time of Sunrise in India(Kerala) and Moon's conjunction effects on markets may be seen in countries (Asia / Europe / US) where trading take places at the time of conjunction(0°). When the angular difference between the 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 (note: expect only eighty percent accuracy in assumptions based on Moon's conjunction with Mars, Venus and Jupiter as some other astro factors may also influence the market). Since Saturn is in retrograde from 12th March to 4th August the market may be highly volatile. As Mercury also in retrograde from 19th May to 12th June, nifty may have tendency to move downwards in that period. As Moon conjuncts with Mars and Venus on 18th and 21st respectively Nifty may move downwards on 19th and 22nd.