Definition: A day is a unit of time representing a full rotation of the Earth on its axis, typically 24 hours.
History/origin: Based on the natural cycle of day and night; widely adopted in ancient calendars.
Current use: Used universally to divide time and schedule activities.
Definition: A year is a unit of time representing the period it takes for the Earth to complete one orbit around the Sun, approximately 365.25 days.
History/origin: Originated from astronomical observations of the Earth's orbit; forms the basis of the Gregorian calendar.
Current use: Used worldwide for calendar years, age measurement, and long-term planning.
| Days | Years |
|---|---|
| 182.625 | 0.500 |
| 365.25 | 1.000 |
| 730.5 | 2.000 |
| 1,095.75 | 3.000 |
| 1,826.25 | 5.000 |
Formula: Years = Days ÷ 365.25
Example: convert 730.5 days to years:
730.5 ÷ 365.25 = 2 Years