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Originally Posted by Bill O'Rights
Wouldn't it be easier to just look at a calender?
Mine says that you are correct. Your sister's birthday is on a Tuesday.
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Once you memorize the month codes, and, at most, this year and the next, you can do this on the fly, in your head, anywhere, extremely fast.
So, probably yes, if you have a calendar in front of you, and it's already open to the right month. If you have to flip for the month, probably not. If you don't have a calendar, definitely not.