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A year is the orbital period of the Earth moving in its orbit around the Sun. In astronomy, the Julian year is a unit of time; it is defined as 365.25 days of exactly 86400 seconds (SI base unit), totalling exactly 31557600 seconds in the Julian astronomical year.
A day is a unit of time. In common usage, it is either an interval equal to 24 hours or daytime, the consecutive period of time during which the Sun is above the horizon. The pe ..more definition+
In relation to the base unit of [time] => (seconds), 1 Years (yr) is equal to 31536000 seconds, while 1 Days (day) = 86400 seconds.| 1800 Years | to common time units |
|---|---|
| 1800 yr | = 56764800000 seconds (s) |
| 1800 yr | = 946080000 minutes (min) |
| 1800 yr | = 15768000 hours (hr) |
| 1800 yr | = 657000 days (day) |
| 1800 yr | = 93857.142857143 weeks (wk) |
| 1800 yr | = 1800 years (yr) |
| 1800 yr | = 21600 months (mo) |
| 1800 yr | = 179.97717184528 decades (dec) |
| 1800 yr | = 17.997717184528 centuries (cent) |
| 1800 yr | = 1.7997717184528 millenniums (mill) |