The HaMaor Mikraos Gedolos chumash has a chart of molad (forecasted first visibility of the new moon in Jerusalem, based on averages observable to the naked eye, assuming Jerusalem local time; am I getting that right?) times in the back, which is great, but it seems like it's off by a day every so often.
For instance, they announced in shul that the Molad for Av, 5770, is Sunday, 6:07 (+ 17/18) PM, and rosh chodesh (the official New Moon day) is Monday. But my chart had it as Monday night, 6:07 +17/18.
(My chart also has a note that they call 6PM-6AM "night.") Is my chart just wrong, or am I reading it incorrectly? This isn't the first time this has happened.