[Dennis]

Originally Posted by M54

Is that Pluto's movement around the Sun that we can see?
Molly.

Hi Molly

Thanks and what a good question! I had assumed that the movement had 2 components; both the Earth’s movement in its orbit and Pluto’s movement along its orbital path. However, I hadn’t realized how small Pluto’s contribution was until Rob very nicely explained the difference in his post!

Originally Posted by Rob_K

Most of the apparent movement in Dennis' shots is a parallax effect of Earth's orbital movement I think.
Cheers -
Rob

Hi Rob

Thanks for your comments and the excellent explanation to Molly’s question. I appreciate you doing the maths and clarifying the nature of the movement. Another lesson learned today at the Ice In Space School!

Cheers

Dennis