Novel calendar system creates regular dates: An American physicist has developed a "rational" calendar of 364 days, in which each date falls on the same day of the week every year, thus saving profs the bother of drawing up new homework schedules every September.

His constraints meant eight months would have different lengths than they do now. March, June, September, and December would each contain 31 days, while the other months would each get 30. To keep the calendar in synchronisation with the seasons, Henry inserted an extra week - which is not part of any month - every five or six years. He named the addition "Newton Week" in honour of his favourite physicist, Isaac Newton.

"If I had my way, everyone would get Newton Week off as a paid vacation and could spend the time doing physics, or other activities of their choice," he says.

Despite this incentive, Henry says he has encountered resistance to his plan - mainly because people would be "stuck" with a birthday that always falls on a Wednesday, for example. Henry, who is among that group, is not moved by the argument. "You have my permission to celebrate your birthday the preceding or following Saturday," he says.

-K

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