[Roger Hunter]

(10-07-2016, 05:33 PM)Roger Hunter Wrote:

(10-07-2016, 05:04 PM)Duffy Wrote:

(10-07-2016, 03:09 PM)Roger Hunter Wrote:

(10-07-2016, 02:26 PM)Duffy Wrote:

(10-07-2016, 02:11 PM)Roger Hunter Wrote: Duffy are you taking the sun's latitude into account? It makes a huge difference in where the 90 degree radius circle falls.

Roger

I did Roger, I've been recording a continuous pattern for several days which suggests an anomaly alternating in daylight and semi-daylight. Combined with other data, I found my error and Svalbard seems to fit the picture ... Glad your back !

Duffy

Not entirely, house still not sold.

Anyway, I was wondering if a program would help which would accept a time and create a map with the lines which shows all points 90 degrees from the sun and moon at that moment? 

Roger

Ideally, a program which would accept a time ... compute longitude of sun and moon ... and compute their longitudes relative to a 1 hour motional transit eg; the sun transits 15 degrees of longitude an hour, a program needs to calculate it's central position ... and it's position 7' 30' ahead and 7' 30' prior to the input time.  Same goes for the moon, which would be a little harder as it's motional transit varies with it's orbital distance.  Such a program would save time and errors !

Duffy

I'll see what I can do. More later.

Roger

Can you post a couple of samples with the correct answers to use as test cases?

I need date and time (UTC) for each.

Roger