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Old 18-02-2013, 11:10 AM
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mental4astro (Alexander)
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mental4astro is offline
 
Join Date: Jun 2008
Location: sydney, australia
Posts: 5,006
The pics you've posted are 12 days apart, and one hour different. Putting the hour aside, the 12days is sufficient to show the change in altitude of the sun as it tracks against the sky, hence the shift in position of the spot.

In the left margin of this page is an icon link to the moon phase. Click on this page & you'll see a table that includes the rise and set of the sun. Just this week alone the is an 8 minute difference in setting times. Extend this over two weeks and the difference is greater, and you'll actually notice it when you go outside at the exact same time over the course of a week or two, particularly in the morning.

This change in time also has a matching shift in altitude of the sun, or the point along the horizon where it rises from.

This also seen in the apparent shift in the spot's position.

Now, add the hour to the scene (48 min to be precise) and you'll have a corresponding shift in the spot's position too. In the first pic below the sun is just beginning to impinge on the frame. In the second the sun is lower down & in the frame. Of cause the spot will shift as it moves with the relative position of the sun that I mentioned below. Move the camera ( here the sun) and the internal reflections will shift.

Nothing strange going on.
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