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This is a New Zealand Defence Force public release of RNZAF file AIR 39/3/3, "Flying Saucers," which covers 1952 to 1955 and was declassified in September 2010 under the Official Information Act. It collects sighting reports from the public and military personnel, press clippings, and a table of 1952 sightings. It also holds Carter Observatory opinions attributing some reports to meteors. A large part covers the inquiry into lights seen from National Airways Corporation Flight 108 on 31 October 1955, which the RNZAF could not fully explain as Venus.
“Etna”1 page
Read from the scan by GLM-OCR; expect the odd misread word.
G.M.T. Zenith Distance Diff. True Bearing
0800 87°47'.5 53'.6 247°55'
0805 8841.3 53.6 24708
0810 8934.9 53.1 24621
0815 9028.0 53.0 24534
0820 9121.0 52.5 24446
0825 9213.5 24358
The time of setting for Venus may be interpolated or extrapolated by the above table for the following factors:-
(a) At sea level with no refraction, $ \mathrm{Z.D.}=9 0^{\circ} 0 0^{t} $
(b) At sea level for refraction of $ 3 4^{\prime} $ . Z.D. $ = 9 0^{\circ} $ $ 3 4^{\prime} $
(c) At 8,000 feet and no refraction, $ \mathrm{Z.D.}=9 1^{\circ} 2 8^{\dagger} $
(A.N.T. tables give dip for 8,000 feet as $ 8 8^{\circ} $)
(d) At 8,000 feet and refraction of $ 4 0^{\prime} $ , Z.D. $ = 9 2^{0} $ $ 0 8^{\prime} $
The allowance for refraction at 8,000 feet is generous, in that a table in the Air Almanae gives a refraction of about $ 1^{\circ}40^{\prime} $ for altitude 8,000 feet, and would make the time of setting much later, since a Z.D. of $ 93^{\circ}08^{\prime} $ is then required.
## 4. POSITION LINES FOR SETTING TIMES OF VENUS:
While the accuracy of data in Section (3), has been verified by various partial checks, it may be argued that since they apply to only one point, the results may be different for other points. To cover this contingency the following lines for equal times of setting (or position lines for given zenith distances at given times) have been calculated. They have been calculated for a height of 8,000 feet (dip 68") but no allowance for refraction. Variations in the times of these position lines for various factors can be allowed for in conjunction with the table in Section (3).
O.M.F./Lat.35°B 36°B 37°B 38°B 39°B 40°B
0800176°58' 177°35' 178°09' 178°44' 179°20' 179°57'
080517543 17620 17654 17729 17805 17842
081017428 17505 17539 17614 17650 17727
081517314 17350 17424 17459 17535 17612
082017159 17235 17309 17344 17420 17457
082517044 17121 17154 17229 17305 17348
083016929 17006 17039 17114 17150 17227
For arguments of G.N.T. in the left hand vertical column, and latitude in the top horizontal row, the body of the table gives longitudes east of Greenwich.
Plotting these values on a chart exhibits quite clearly that Venus would be visible from the aircraft during the whole flight, except for any cloud that might be present.
## 5. ALTAZIMUTH CORRIDINATES FOR SATURN:
Assumed position: Latitude 39°S
Longitude 174° 11' E.
No allowance for dip or refraction.
The assumed position of 1' further east was an accidental error Document, cited by the archive. The PDF is mirrored here; the original link is above. The text was read from the page images by GLM-OCR; expect the odd misread word. 445 pages are in the text index: search them above, or from the library's search.