Jan 27, 2026Learn how to quickly check if a year is a leap year based on simple mathematical rules.

Jan 20, 2026Learn how to calculate the golden number in lunar cycles to determine Easter dates and lunisolar calendar events.

Nov 9, 2025Explore the probability of having 53 Mondays or Saturdays in a leap year due to the extra day in February.

Oct 4, 2025Learn the simple formula to calculate your average monthly presents. Understand how to analyze gift-giving trends easily.