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As I understand it, generally speaking: If you count the correct number of days (ideally also weeks, but days is the most important) in any way (e.g., "tonight we count...") after Tzeis Hacochav...
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#1: Initial revision
As I understand it, generally speaking: * If you count the correct number of days (ideally also weeks, but days is the most important) in any way (e.g., "tonight we count...") *after Tzeis Hacochavim (3 stars)* then you have fulfilled the Mitzvah for that day. Which means you can't count later that day with a Bracha but absolutely no problem continuing the *next* night with a Bracha. * If you count the correct number of days for the coming night *between Shkia (sunset) and Tzeis Hacochavim* then there is a doubt as to whether you have fulfilled the Mitzvah for that day. Which means you can't count later that day with a Bracha. You can either count without a Bracha, later that day, or you can listen to someone else's Bracha and answer Amen and then count yourself. If you count (with or without someone else's Bracha) then you have absolutely no problem continuing the *next* night with a Bracha. Where there is a problem is if you *only* count between Shkia and Tzeis Hacochavim and do not count any time later that night or during the day. Then you have a real question as to whether you have counted properly or not, and the answer may vary depending on other factors, including local practices. Ask your local Rabbi.