The 24 solar terms in 2026, and why the date moves every year
A solar term is a moment, not a day: 寒露 2026 is 8 October at 14:29. Here are all 24 with their times, matching the Hon...
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Two published rules for the new moon disagree about one month in three
MABIMS and Muhammadiyah's wujudul hilal are both published and computable a year ahead. Worked through fourteen lunation...
A4 is the answer to an equation, and US Letter is not the answer to anything
Two constraints — a ratio of √2 and an area of one square metre — have exactly one solution, and that solution is A0. Th...
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The octane numbers on American and Asian pumps are not the same scale
American 87 is roughly 91 RON, because the United States posts the average of two laboratory tests while most of the wor...
One sky, three verdicts: why Singapore says unhealthy and Malaysia says moderate
The same 70 micrograms of fine particulate reads 116 on Singapore's PSI, 96 on Malaysia's API and 161 on the US AQI. Alm...
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