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Congratulations for your Valaikkappu. you can go on the same day ie may 7th 2009(for india night) because thithi & rasi remains same and about timing it is calculated depending on the sunrise. for india nalaneram is from morning 10:30 to 11:30 & evening 12:30 to 1:30. I m not sure about here better you consult with ur astrologer regarding timings.
dont get confuse on this. take care of yourself & baby.