Articles
A calculator answers the question you brought it. These are the questions behind that one — why the measurement is ambiguous, where the constant comes from, what the standard actually says. Every figure quoted is read out of the same specification the calculator runs, so the article and the tool cannot drift apart.
A cup of flour is not a weight3 minThe same cup holds 120 g or 160 g of flour depending on how you filled it — a third more — while a cup of sugar weighs 198 g however you fill it.Why 1 January 2027 falls in week 53 of 20262 minISO 8601 gives a week to the year that owns its Thursday, which is why 2026 has 53 weeks and why payroll and your calendar app can disagree by a whole week.Easter moves, but not randomly2 minEaster is the first Sunday after the first ecclesiastical full moon on or after 21 March. The rule is pure arithmetic, which is why a date from the sixth century can be computed exactly.The inch is exactly 25.4 mm, and the agreement is younger than most houses2 minBefore 1959 the American inch and the British inch were different lengths. The number that settled it is exact by definition, not by measurement.