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
flagCanada
16%
8%
50%
25%
24
flagItaly
7%
7%
50%
35%
14
flagFrance
8%
8%
41%
41%
12
flagthe Netherlands
16%
8%
41%
33%
12
flagLithuania
0%
8%
41%
50%
12
flagSpain
0%
0%
40%
60%
10
flagthe United Kingdom
15%
14%
39%
30%
124
flagthe Philippines
30%
30%
38%
0%
13
flagthe United States
23%
11%
37%
27%
244
flagNorway
37%
6%
37%
18%
16
flagPoland
17%
12%
35%
34%
4282
flagGermany
24%
13%
30%
28%
69
flagthe United Arab Emirates
40%
20%
30%
10%
10
flagRepublic of Ireland
20%
10%
30%
40%
10
flagIndia
33%
19%
28%
17%
107
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%

Language versions

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What was the exposure time of this photo?
634
38%

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