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A popularity-contest is a competition where the answer with the highest vote tally (upvotes minus downvotes) wins. As these are frequently closed, read the tag info and post your challenge to the sandbox first.
27
votes
Make a circle illusion animation
Excel (no VBA)
=2*PI()*(NOW()*24*60*60/A2-FLOOR(NOW()*24*60*60/A2,1))
=ROUND(7*SIN(A1),0)
=ROUND(5*SIN(A1+1*PI()/4),0)
=ROUND(7*SIN(A1+2*PI()/4),0)
=ROUND(5*SIN(A1+3*PI()/4),0)
A2 (period) determ …