Merging eclipse photos

<p>I have taken a series of 13 sun photos at a partial eclipse, at fixed 10 min intervals (sort of) with an ND filter and the camera tripod mounted. Of course the sky is all black.<br>

What I want to do is to merge all the pictures, so you will see all the suns on a nice curved line over the sky.<br>

I have Aperture, Capture NX and (on my Parallels virtual machine) Photoshop elements. One solution I have thought might work was to convert all pictures to negative and use the Elements merging tool, and then convert back. But if any could devise a less cumbersome solution, I would be glad. Thanks!</p><div></div>

<p>Not sure this is any less cumbersome;<br>

1. bring all images into one psd as layers<br>

2. with the last layer (top) reduce the opacity slightly until the image below can be seen<br>

3. on the top layer use the erase tool set to brush & 100% and erase until image below is fully visible<br>

4. restore top layer to 100% opacity<br>

5. Merge top layer with layer below<br>

6. repeat process going down through the layers</p>

<p>Bring in all the images as layers, then set the blend mode of each layer to "lighten". Done.</p>

<p>Tom M.</p>