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
flagUU
8%
0%
75%
16%
12
flagCanada
16%
8%
50%
25%
24
flagNorway
33%
5%
44%
16%
18
flagItaly
7%
7%
50%
35%
14
flagFrance
7%
7%
42%
42%
14
flagthe Netherlands
16%
8%
41%
33%
12
flagLithuania
0%
8%
41%
50%
12
flagSpain
0%
0%
40%
60%
10
flagthe United Kingdom
16%
15%
38%
29%
129
flagthe Philippines
30%
30%
38%
0%
13
flagthe United States
23%
10%
37%
27%
247
flagPoland
17%
12%
35%
34%
4453
flagRepublic of Ireland
20%
10%
30%
40%
10
flagthe United Arab Emirates
40%
20%
30%
10%
10
flagGermany
25%
12%
29%
29%
71
flagIndia
33%
20%
28%
17%
112
flagAustralia
33%
8%
16%
41%
12

Gender

men34%
women35%
about 10 seconds
14%
19%
about 10 minutes
11%
13%
about 1 hour
34%
35%
about 8 hours
38%
31%

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What was the exposure time of this photo?
648
38%

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