The concept of an hour as a unit of time has its roots in ancient Egypt, around 1500 BCE, when sundials were used to divide daylight into 12 equal parts. This uneven division, which varied with the seasons, was later standardized by the Greeks and Romans. The 24-hour division we use today first appeared in the late 13th century, influenced by the development of mechanical clocks in medieval Europe.
Interestingly, despite its seemingly mundane nature, the hour is deeply intertwined with human culture and religion. For example, in Christianity, the canonical hours mark specific times of prayer throughout the day, a practice dating back to the early Middle Ages. Even today, the hour impacts how society organizes work, entertainment, and rest, shaping our daily lives in profound ways.
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.
| Hours | Weeks |
|---|---|
0
h
|
0
week
|
2
h
|
0.0119048
week
|
4
h
|
0.0238095
week
|
6
h
|
0.0357143
week
|
8
h
|
0.047619
week
|
10
h
|
0.0595238
week
|
12
h
|
0.0714286
week
|
14
h
|
0.0833333
week
|
16
h
|
0.0952381
week
|
18
h
|
0.107143
week
|
20
h
|
0.119048
week
|
22
h
|
0.130952
week
|
24
h
|
0.142857
week
|
26
h
|
0.154762
week
|
28
h
|
0.166667
week
|
30
h
|
0.178571
week
|
32
h
|
0.190476
week
|
34
h
|
0.202381
week
|
36
h
|
0.214286
week
|
38
h
|
0.22619
week
|
40
h
|
0.238095
week
|
42
h
|
0.25
week
|
44
h
|
0.261905
week
|
46
h
|
0.27381
week
|
48
h
|
0.285714
week
|
50
h
|
0.297619
week
|
52
h
|
0.309524
week
|
54
h
|
0.321429
week
|
56
h
|
0.333333
week
|
58
h
|
0.345238
week
|
60
h
|
0.357143
week
|
62
h
|
0.369048
week
|
64
h
|
0.380952
week
|
66
h
|
0.392857
week
|
68
h
|
0.404762
week
|
70
h
|
0.416667
week
|
72
h
|
0.428571
week
|
74
h
|
0.440476
week
|
76
h
|
0.452381
week
|
78
h
|
0.464286
week
|
80
h
|
0.47619
week
|
82
h
|
0.488095
week
|
84
h
|
0.5
week
|
86
h
|
0.511905
week
|
88
h
|
0.52381
week
|
90
h
|
0.535714
week
|
92
h
|
0.547619
week
|
94
h
|
0.559524
week
|
96
h
|
0.571429
week
|
98
h
|
0.583333
week
|
100
h
|
0.595238
week
|
102
h
|
0.607143
week
|
104
h
|
0.619048
week
|
106
h
|
0.630952
week
|
108
h
|
0.642857
week
|
110
h
|
0.654762
week
|
112
h
|
0.666667
week
|
114
h
|
0.678571
week
|
116
h
|
0.690476
week
|
118
h
|
0.702381
week
|
120
h
|
0.714286
week
|
122
h
|
0.72619
week
|
124
h
|
0.738095
week
|
126
h
|
0.75
week
|
128
h
|
0.761905
week
|
130
h
|
0.77381
week
|
132
h
|
0.785714
week
|
134
h
|
0.797619
week
|
136
h
|
0.809524
week
|
138
h
|
0.821429
week
|
140
h
|
0.833333
week
|
142
h
|
0.845238
week
|
144
h
|
0.857143
week
|
146
h
|
0.869048
week
|
148
h
|
0.880952
week
|
150
h
|
0.892857
week
|
152
h
|
0.904762
week
|
154
h
|
0.916667
week
|
156
h
|
0.928571
week
|
158
h
|
0.940476
week
|
160
h
|
0.952381
week
|
162
h
|
0.964286
week
|
164
h
|
0.97619
week
|
166
h
|
0.988095
week
|
168
h
|
1
week
|
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