Baker report, 1968 congressional hearings

The long persistence of the images would have required the airplanes to have moved on a unique parabolic path with
Mariana at the focus. Unfortunately, these hypothetical parabolic paths would be incompatible with the 171° heading
defined by the data. In addition, the apparent size of the images (admittedly
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Fig. 4. Map of Great Falls, Montana, including hypothetical UFO paths.
[[180]]
enhanced by flaring, halation, adjacency effects, etc.) is also not compatible with the photographic experiments, since
planes close enough to give rise to the images shown on the film clip would also exhibit some airplane structure as shown
in Figure 6-24, page 323 of reference [3] in which the airplane images are of a size and brightness comparable to that of the
unknowns.
This figure is a blow-up of a 16 mm frame from a camera of the same type as Mariana's, with the same stop setting and 3"
telephoto lens. During the experimental filming, relative Sun angle, weather, etc., were the same as that reported by
Mariana and verified by the Montana film itself, except that the jets were on a different heading -- not 171° -- in order to
obtain optimal Sun reflections. The jet planes shown in the figure were at a distance of 2.5 miles and their structure