How Long is a Day on the Moon?

one earth day
about four earthly weeks
one earth year
the length is very variable
The transition from day to night is caused by the spinning of the Earth about its axis. The same occurs on the moon. However, the difference is that It takes 28.5 days for the moon to spin about its axis. So one moon-day is 28.5 Earth-days long!
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Answers by country

one earth day
about four earthly weeks
one earth year
the length is very variable
answers
flagthe Netherlands
36%
63%
0%
0%
11
flagPakistan
0%
60%
0%
30%
10
flagIndia
20%
53%
9%
15%
106
flagRepublic of Ireland
11%
50%
27%
11%
18
flagFrance
25%
50%
8%
16%
12
flagthe United States
28%
44%
16%
10%
59
flagPoland
25%
40%
10%
22%
8849
flagGermany
41%
27%
17%
13%
29
flagthe United Kingdom
2%
2%
0%
94%
762
flagGreece
0%
99%
0%
0%
723
flagAustralia
47%
0%
5%
47%
17