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
flagMalaysia
10%
20%
60%
10%
10
flagFrance
8%
4%
56%
30%
23
flagNorway
30%
5%
50%
15%
20
flagCanada
20%
8%
48%
24%
25
flagthe Philippines
23%
23%
42%
4%
21
flagLithuania
0%
8%
41%
50%
12
flagthe United Arab Emirates
30%
15%
38%
15%
13
flagthe United States
22%
11%
37%
27%
270
flagthe United Kingdom
20%
16%
36%
26%
187
flagSpain
9%
0%
36%
54%
11
flagPoland
16%
12%
35%
35%
6321
flagGermany
20%
10%
35%
31%
105
flagItaly
5%
17%
41%
35%
17
flagthe Netherlands
12%
18%
31%
37%
16
flagUnknown
11%
10%
30%
47%
393
flagSweden
20%
20%
30%
30%
10
flagIndia
32%
18%
29%
19%
163
flagRepublic of Ireland
20%
6%
26%
46%
15
flagAustralia
33%
13%
20%
33%
15

Gender

men33%
women33%
about 10 seconds
13%
18%
about 10 minutes
10%
13%
about 1 hour
33%
34%
about 8 hours
42%
33%

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What was the exposure time of this photo?
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38%

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