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
flagCanada
20%
8%
48%
24%
25
flagNorway
33%
4%
47%
14%
21
flagthe Philippines
23%
23%
42%
4%
21
flagLithuania
0%
8%
41%
50%
12
flagthe United States
22%
11%
38%
26%
280
flagthe United Arab Emirates
30%
15%
38%
15%
13
flagthe United Kingdom
20%
16%
37%
25%
189
flagSpain
9%
0%
36%
54%
11
flagPoland
16%
12%
35%
35%
6541
flagGermany
20%
10%
35%
31%
105
flagItaly
5%
17%
41%
35%
17
flagSwitzerland
8%
33%
33%
25%
12
flagPakistan
33%
8%
33%
25%
12
flagUnknown
11%
11%
30%
46%
406
flagIndia
32%
17%
30%
19%
170
flagthe Netherlands
11%
23%
29%
35%
17
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%
33%
about 8 hours
42%
33%

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What was the exposure time of this photo?
818
38%

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