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From: Jan Aldrich <jan@CYBERZONE.NET>
Date: Thu, 29 Jan 1998 23:19:01 -0800
Fwd Date: Fri, 30 Jan 1998 02:49:19 -0500
Subject: Project 1947: DAY/NIGHT - More *U* Findings

Larry Hatch is having some difficulty posting. Don't feel alone
Larry, I am, too.

--
Jan Aldrich
Project 1947
http://www.iufog.org/project1947/

Subject: More boring DAY/NIGHT *U* findings.
Date: Thursday, January 29, 1998 02:56 AM

to: List Members
from: Larry Hatch
re: *U* Database findings.

I recently sent in some findings about day versus night UFO
sightings from the *U* UFO Database. Since then, I refined the
statistical routine to subdivide the raw data by decades.

The *U* Database has 16,575 sightings listed as of 28 JAN'98.
Of these, 12,121 have 'known' time-of-day (plus or minus one hour
to allow for Daylight Savings time and time-zone anomalies.)

'DAY' is defined as the hours 1000-1600hrs. 'NIGHT' is defined as
2200-0400hrs. These strict 6-hour periods are broad daylight, or
dark of night, for most of the world, the year around. Sightings
for all other hours are considered 'FRINGE', i.e. light or dark,
dawn or dusk depending on latitude and season.

Here's the raw data from the new routine:

Date Period:       TOTAL       DAY       NIGHT   FRINGE

ALL YEARS          12121      1464        4223     6434
pre -1960           3353       709         869     1775
1960 onward         8718       747        3340     4631

These figures are now subdivided as follows:

pre - 1900            50         8          14       28
1900s    . . . .      90         9          35       46
1910s    . . . .      23         2           9       12
1920s    . . . .      13         5           3        5
1930s    . . . .      21         4           5       12
1940s    . . . .     576        180        100      296
1950s    . . . .    2630        509        717     1404
1960s    . . . .    2036        205        768     1063
1970s    . . . .    3193        249       1267     1677
1980s    . . . .    1270         97        459      714
1990s    . . . .    2219        196        846     1177

Note  the 1940s  when 'broad daylight' sightings outnumbered
dark-of-night by a 9 to 5 ratio.

I have no ready explanation for the steady drop in the ratio of
'day' sightings since 1940, and invite discussion.

-  Larry Hatch <larryhat@jps.net>