What was the exposure time of this photo?

about 10 seconds
about 10 minutes
about 1 hour
about 8 hours
The length of stars trails is pretty much the same as the distance trav­elled by an hour hand of clock during 30 minutes. But the Earth rotates twice as slow compared to the hour hand of a clock (one rotation per day, while clock's hour hand makes two).

Answers distribution

about 10 seconds
about 10 minutes
about 1 hour
about 8 hours
answers
flagFrance
8%
4%
56%
30%
23
flagCanada
20%
8%
48%
24%
25
flagNorway
31%
5%
47%
15%
19
flagthe Philippines
21%
26%
47%
5%
19
flagLithuania
0%
8%
41%
50%
12
flagthe United States
23%
11%
37%
26%
264
flagItaly
6%
18%
43%
31%
16
flagthe United Kingdom
20%
16%
36%
26%
177
flagSpain
9%
0%
36%
54%
11
flagPoland
16%
12%
35%
35%
5936
flagthe Netherlands
14%
14%
35%
35%
14
flagthe United Arab Emirates
33%
16%
33%
16%
12
flagUnknown
10%
11%
31%
46%
343
flagRepublic of Ireland
23%
7%
30%
38%
13
flagIndia
34%
19%
29%
17%
141
flagGermany
22%
12%
29%
32%
89
flagAustralia
33%
13%
20%
33%
15

Gender

men33%
women34%
about 10 seconds
13%
18%
about 10 minutes
11%
13%
about 1 hour
33%
34%
about 8 hours
41%
33%

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What was the exposure time of this photo?
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37%

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