So far I understand the rules for postponing Rosh HaShanah, and sometimes it needs to be put off for one or two days. What I don’t get is just how that works with adding one day to Chesvan it removing one day from Kislev. Doesn’t adding/removing one day only allow you to postpone or pull up Rosh HaShanah by just one day? How do you properly add two days? And everything I’m reading only ever days “postpone”, so when is one day removed?
Can someone properly explain how chaserah, kesidrah, and shlemah years work?
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