Project Blue Book Special Report No. 14 (Analysis of Reports of Unidentified Aerial Objects)

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----------------------
Total Less Unknown
Unknown
Per Cent
Per Cent
I
60
I
50
I
40
I
30
I
20
I
10
I
0
0
IO
I
20
I
30
I
40
I
50
I
60
I
I
Sunlight on
mirror or
aluminum
-
Sunlight on -
plaster,
stone or soil
--
-
(1,1
/
Brighter
than moon
U)
~
-
Like moon
..
,...
...
-
Duller
'
than moon ...
-
Not stated
Fl GURE 23 COMPARISON OF KNOWN AND UNKNOWN OBJECT SIGHTINGS BY LIGHT BRIGHTNESS,
1947-1952
A•7501