Tomarrow(17-05-2012) Moon will be transitting Revati Nakshatra, whose lord Mercury is well placed in Rasi at Market opening time, but badly placed in 8th house in Navamsa with Rahu.
Negative opening is expected.
During Intraday(from 09:15AM to 15:30PM), Lagna will transit four Rasis,viz, Gemini, Cancer, Leo and Virgo.
Moon's Nakshatra lord Mercury will be :
Positive for Gemini Lagna,
Negative for Cancer Lagna,
Positive for Leo Lagna, and
Negative for Virgo Lagna.
So, rough Intraday Movement of Nifty could like this :
Thanks @ Regards.