Local Sidereal Time

The following graphs show the relationship of GCP data to local sidereal time at each individual egg site. John Walker did an early analysis, explaining that binning by local sidereal time aggregates data based on the apparent position of celestial objects beyond the solar system at each individual egg site. For example, at about 17:42 local sidereal time the centre of the Milky Way galaxy will transit the meridian above an egg site.

In February, 2003, Mike Meyer completed a comprehensive look at two years of GCP data in which he concludes there is no effect or correlation with sidereal time.

My program was set to read the raw GCP files and give each 200 bit trial a Z score. When possible, the empirical SD was used rather than the theoretical SD. The LST of the egg was determined, and the Z squared value was added to the values previously stored in that sidereal minute. Each egg had its own 1440 values stored separately, so that the results could latter be separated into northern / southern hemispheres. For each Z squared value added, the degrees of freedom for the egg at that minute was incremented by one. When the two years of data had been done (Jan2000 to Dec2001), the results for each minute could be found by adding the Z squared values of the desired group of eggs. The same group of eggs had their degrees of freedom added together as well. There were 36 eggs used in the northern hemisphere, with eight in the southern hemisphere.

Once the data for the desired combination of eggs was obtained, the data was combined into two averaging window lengths of two and four hours. The Z score of the window was then calculated, and plotted on a graph. The data was made to wrap around midnight, so for example the 00:00 LST point on the two hour window graph contains data from hour zero and hour 23.

The two graphs show no signs of any effect of LST, so either there is no effect, or the effect may be too small to be seen in this amount of data.

2 hour window Local Sidereal Time

4 hour window Local Sidereal Time

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