Very nice drawing Ja...........Oh it is on now!........ you wana go old school ..............I can see im gona have to get out my 3d rendering tools.....LOL... Your drawing on the blue dots will only ever observed nightly. they are not postioned to see the annual that i can tell........... Your drawing does not show exactly what we are agruging..I'll see what i can do....... it might be tommorow though....excelent drawing though :-) j a <ja_777_aj@xxxxxxxxx> wrote: Here is the best drawing I can do right now. The orange ball is the earth at 1.5 month intervals during the year. The Green pole is the annual axis. The red pole is the nightly axis. The blue circles are our camera at 3 hour intervals each night. To record 8 points of our annual star trails we will take a picture at midnight at each of the 1.5 month intervals. The camera position at midnight for each of the 8 locations must fall on the circle partially descibed by the blue dots, while also facing directly away from the center of everything (the sun). Will this record an annual or a nightly trail? --------------------------------- Never miss a thing. Make Yahoo your homepage.