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
flagUnknown
19%
11%
53%
15%
26
flagCanada
16%
8%
50%
25%
24
flagthe Philippines
23%
23%
47%
5%
17
flagNorway
33%
5%
44%
16%
18
flagItaly
7%
7%
50%
35%
14
flagFrance
11%
5%
41%
41%
17
flagLithuania
0%
8%
41%
50%
12
flagSpain
0%
0%
40%
60%
10
flagthe United Kingdom
17%
16%
39%
26%
145
flagthe United States
23%
10%
38%
26%
249
flagthe Netherlands
15%
7%
38%
38%
13
flagPoland
17%
12%
35%
34%
4597
flagRepublic of Ireland
20%
10%
30%
40%
10
flagIndia
34%
19%
29%
16%
121
flagGermany
23%
11%
29%
32%
77
flagthe United Arab Emirates
36%
18%
27%
18%
11
flagAustralia
33%
8%
16%
41%
12

Gender

men34%
women35%
about 10 seconds
14%
19%
about 10 minutes
12%
13%
about 1 hour
34%
35%
about 8 hours
38%
31%

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What was the exposure time of this photo?
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39%

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