[Skywise]

(02-06-2017, 03:34 AM)Roger Hunter Wrote: My question was if the quake is 90 degrees from the cross is that sunrise/set by definition.

No. Let's look at a simplified case.

Let's put the cross on the North pole.

On the Winter Solstice, we already know that the North Pole is in perpetual darkness. So no matter the time on this day, it will never be in sunrise or sunset on that day.

Now imagine a quake on the equator. Doesn't matter where as long as the latitude is zero.

This quake is exactly 90 degrees from the North Pole - exactly 90 degrees from the cross.

Yet, no sunrise/sunset.

This is an extreme case, but unfortunately it shows that you cannot use your assumption.

Just calculate the sun angle of the cross locations at the time of the quake. This should give you an angle you can use to determine angle to the horizon, and from that decide if the location is in sunrise/set.

Reversing this, the prediction would be, any time a cross is in sunrise/sunset, there may be a quake somewhere on the planet. This is TOO LOSE of a specification to have any statistical significance.

Am I missing something?

Brian