What part of the Moon surface had been known to humanity before the first photos of the dark side were taken in 1959?

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59%
81%
100%
Moon's libration changes the angle from which the Moon is seen, allowing about 59% of its surface to be seen from the Earth (but only half at any instant). Moon's libration is caused by the eccentricity of its orbit around Earth and by a slight inclination of its axis of rotation.
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52%
59%
81%
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flagSingapore
26%
66%
6%
0%
15
flagSouth Africa
38%
57%
0%
0%
21
flagFrance
33%
55%
3%
3%
27
flagPoland
34%
53%
7%
3%
19893
flagNew Zealand
33%
51%
3%
7%
27
flagthe United Kingdom
33%
50%
9%
5%
333
flagMalaysia
27%
50%
0%
5%
18
flagthe Philippines
36%
46%
10%
6%
99
flagGermany
41%
46%
7%
4%
65
flagthe Netherlands
52%
44%
4%
0%
25
flagIndia
39%
43%
10%
5%
971
flagRepublic of Ireland
41%
43%
12%
2%
39
flagGreece
52%
42%
5%
0%
19
flagthe United Arab Emirates
51%
40%
0%
8%
35
flagthe United States
43%
38%
9%
5%
799
flagAustralia
41%
38%
11%
6%
78
flagPakistan
52%
38%
5%
3%
55
flagUnknown
37%
37%
17%
7%
40
flagNigeria
44%
33%
11%
5%
18
flagCanada
57%
28%
10%
2%
70