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3 results for “calendar”.

• Why Some Holidays Move Around the Calendar Every Year
  Christmas never budges, Ramadan arrives about eleven days earlier each year, Easter swings across a month, and Chinese New Year dances between late January and late February. Four holidays, four different celestial machines underneath them — and one calendar compromise to rule them all.
• Leap Years and Leap Seconds: Why the Calendar Keeps Fighting Astronomy
  A year is not 365 days, a day is not 86,400 steady seconds, and humans have spent millennia papering over the mismatch. Here is the arithmetic of leap years, the strangeness of leap seconds, and why both exist.
• How Birds Migrate: The Compass, the Map, and the Fuel Engineering of Flight
  A bar-tailed godwit flies eleven thousand kilometres non-stop across the Pacific — no food, no water, no rest. Bird migration is not a journey; it is a piece of biological engineering with a compass, a calendar, and a metabolic budget. Here is how it works.