[Roger Hunter]

(02-06-2017, 03:03 AM)Skywise Wrote:

(01-31-2017, 02:55 AM)Roger Hunter Wrote: Hi;

I need help with this one if anybody is versed in astronomy.

Duffy's idea is that when he gets a certain bit of information, the position of the sun and moon at that time are significant.

If within 30 days a mag 5+ quake happens, the sunrise/sunset curve will be passing thru one of those points.

Now I can compute the subsolar and sublunar points and I can compute sunrise/sunset times for the quakes but I can't compute the curve representing all the places on earth where they're rising or setting.

I can compute the distance between two points on earth so can I say if sunrise is the right time and it's 90 degrees from a certain location that the curve falls thru that location?

I think so but I'm not sure.

Roger

Sorry everyone for being away so much. Hopefully that will change within a couple of months.

Am I understanding?

1. we have lat/lon points (crosses) [how determined isn't relevant at the moment]
   
2. we have quake lat/lon
   
3. the correlation is true if the cross is in sunrise/sunset at the time of the quake
   

I anticipate being able to be online again this Tuesday.

Brian

Brian;

Yes, if I understand Duffy, that's right.

But check with him to be sure. 

My question was if the quake is 90 degrees from the cross is that sunrise/set by definition.

The earth isn't a perfect sphere so there's bound to be some difference but is it significant?

Roger