Conversion number between year (Gregorian) [a, y, or yr] and lustre; lustrum is 0.20013287671233. This means, that year (Gregorian) is smaller unit than lustre; lustrum.
Switch to reverse conversion:
from lustre; lustrum to year (Gregorian) conversion
| [a, y, or yr] |
Result in lustre; lustrum
?If conversion between year (Gregorian) to second and second to lustre; lustrum is exactly definied, high precision conversion from year (Gregorian) to lustre; lustrum is enabled.
Decimal places: (0-800)
year (Gregorian)| Start value: | [year (Gregorian)] |
| Step size | [year (Gregorian)] |
| How many lines? | (max 100) |
| year (Gregorian) | lustre; lustrum |
|---|---|
| 0 | 0 |
| 10 | 2.0013287671233 |
| 20 | 4.0026575342466 |
| 30 | 6.0039863013699 |
| 40 | 8.0053150684932 |
| 50 | 10.006643835616 |
| 60 | 12.00797260274 |
| 70 | 14.009301369863 |
| 80 | 16.010630136986 |
| 90 | 18.01195890411 |
| 100 | 20.013287671233 |
| 110 | 22.014616438356 |
Definition of year (Gregorian) unit: = 365.2425 d average. As the common year has 365 days, the Gregorian calendar with leap years compensate the deviation from the real, astronomical year. According to this calendar, every 4th year is a leap year, except for every 100th. But every 400th is a leap year. This means that there are 97 leap years in 400 year period. So according to Gregorian's calendar, one year has 365 + 97/400 days (average). This is not a perfect approach, but in 1000 year period, the defiation is only 0.3 days compared to the astronomical year. In the year 1582 Gregorian replaced the Julian calendar.
Definition of lustre; lustrum unit: ≡ 5 years (of 365 d). A lustre is a period of five years. Its use dates back to Ancient Rome, when a lustrum was a five-year period at the end of which a full census of the Roman population would be carried out. = 5*365*86400 = 157.68 Ms
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