Tuesday, April 19
_ 7:30 a.m. (1:30 a.m. EDT): Cardinals celebrate Mass in the hotel chapel.
_ 9 a.m. (3 a.m. EDT): Cardinals gather in Sistine Chapel for two rounds of balloting if new pope not elected Monday.
_ Noon (6 a.m. EDT): Approximate time of first smoke signal from Sistine Chapel. It will indicate whether a new pope has been chosen (white smoke) or no decision has been made (black smoke) in the morning session of balloting. The smoke is from the burning of the secret ballots after the two rounds of voting held mornings and afternoons.
_ 4 p.m. (10 a.m. EDT): Cardinals return to the Sistine Chapel for two rounds of afternoon balloting.
_ 7 p.m. (1 p.m. EDT): Approximate time of smoke signal after second round of voting.
(from yahoo's website)