The second, the base unit of time in the International System of Units (SI), has roots dating back to ancient civilizations. Originally defined through astronomical events, the second was once 1/86,400 of a day, based on Earth’s rotation. However, the Earth’s rotation isn’t perfectly consistent due to gravitational interactions and geological activity, making this measurement imprecise for modern needs.
Today, the second is defined by atomic perfection: it is the duration of 9,192,631,770 periods of the radiation corresponding to a specific transition in the cesium-133 atom. This definition, adopted in 1967, takes advantage of atomic clocks, which can measure time with incredible accuracy, losing only about a second every hundreds of millions of years. Such precision is essential for technologies like GPS, telecommunications, and the synchronization of global networks.
The concept of a week has a fascinating history dating back over 4,000 years to ancient Mesopotamia. This seven-day cycle is believed to have been influenced by the four lunar phases: new moon, first quarter, full moon, and last quarter, each lasting approximately seven days. This structure was later adopted by the Babylonians and eventually spread to other cultures.
The names of the days are rooted in ancient astrology and mythology, with each day of the week named after a god or celestial body in different cultures, such as Latin and Germanic traditions. For instance, Monday is linked to the Moon, and Saturday to Saturn. This rich blend of astronomy, mythology, and history makes the week a truly interdisciplinary unit of time.
| Seconds | Weeks |
|---|---|
0
s
|
0
week
|
50
s
|
0.000082672
week
|
100
s
|
0.000165344
week
|
150
s
|
0.000248016
week
|
200
s
|
0.000330688
week
|
250
s
|
0.00041336
week
|
300
s
|
0.000496032
week
|
350
s
|
0.000578704
week
|
400
s
|
0.000661376
week
|
450
s
|
0.000744048
week
|
500
s
|
0.00082672
week
|
550
s
|
0.000909392
week
|
600
s
|
0.000992063
week
|
650
s
|
0.00107474
week
|
700
s
|
0.00115741
week
|
750
s
|
0.00124008
week
|
800
s
|
0.00132275
week
|
850
s
|
0.00140542
week
|
900
s
|
0.0014881
week
|
950
s
|
0.00157077
week
|
1000
s
|
0.00165344
week
|
1050
s
|
0.00173611
week
|
1100
s
|
0.00181878
week
|
1150
s
|
0.00190146
week
|
1200
s
|
0.00198413
week
|
1250
s
|
0.0020668
week
|
1300
s
|
0.00214947
week
|
1350
s
|
0.00223214
week
|
1400
s
|
0.00231481
week
|
1450
s
|
0.00239749
week
|
1500
s
|
0.00248016
week
|
1550
s
|
0.00256283
week
|
1600
s
|
0.0026455
week
|
1650
s
|
0.00272817
week
|
1700
s
|
0.00281085
week
|
1750
s
|
0.00289352
week
|
1800
s
|
0.00297619
week
|
1850
s
|
0.00305886
week
|
1900
s
|
0.00314153
week
|
1950
s
|
0.00322421
week
|
2000
s
|
0.00330688
week
|
2050
s
|
0.00338955
week
|
2100
s
|
0.00347222
week
|
2150
s
|
0.00355489
week
|
2200
s
|
0.00363757
week
|
2250
s
|
0.00372024
week
|
2300
s
|
0.00380291
week
|
2350
s
|
0.00388558
week
|
2400
s
|
0.00396825
week
|
2450
s
|
0.00405093
week
|
2500
s
|
0.0041336
week
|
2550
s
|
0.00421627
week
|
2600
s
|
0.00429894
week
|
2650
s
|
0.00438161
week
|
2700
s
|
0.00446429
week
|
2750
s
|
0.00454696
week
|
2800
s
|
0.00462963
week
|
2850
s
|
0.0047123
week
|
2900
s
|
0.00479497
week
|
2950
s
|
0.00487765
week
|
3000
s
|
0.00496032
week
|
3050
s
|
0.00504299
week
|
3100
s
|
0.00512566
week
|
3150
s
|
0.00520833
week
|
3200
s
|
0.00529101
week
|
3250
s
|
0.00537368
week
|
3300
s
|
0.00545635
week
|
3350
s
|
0.00553902
week
|
3400
s
|
0.00562169
week
|
3450
s
|
0.00570437
week
|
3500
s
|
0.00578704
week
|
3550
s
|
0.00586971
week
|
3600
s
|
0.00595238
week
|
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