The rotation of AR2833
Posted: Thu Jun 17, 2021 1:46 am
Hi again everyone 
My dear wife and daughter and probably even thecat are upstairs watching the Gilmour Girls. Therefore, I am in the basement doing this, which I was actually going to get around to tomorrow. Well, what with my current circumstances, no time like the present 
Yesterday I took a stack of the Sun with AR2833, which is AR2824 returning for the second time around the face of ol' Sol. I took the pics at 5:14PM EST to be exact.
Today I got in at 2PM, and waited for the weather to either clear or yuck up, especially at 5:14...
As it turned out, I had haze and occasional clouds until just before 5PM. Then it cleared up a bit with a future bank of clouds coming in from the west. Fine by me. At 5:14PM I started shooting...
Full size image here
Not the best conditions or pics (bigachro ring around the disc; could have better faculae) but it was enough for what I wanted to do. How much does a sunspot move in a day? I realize the Sun is fluid and has different rotational rates across its surface, but just for a general idea was my thought. So I merged my two pics from yesterday and today in the proper north-south position of the Sun. showing the movement of AR2833 from left to right.
Based upon the position of the spot and the Sun's diameter at where the spot is moving across, it looks to me to be roughly 160,000 KM's (100K miles) of movement in the past day. Please correct me if I'm wrong; I don't pretend to have a good knowledge of math. Still, looking at the image of the Earth to scale to the bottom right at just under 13000KM's (~8000miles) in diameter, I have to think it's close.
Full size image here
It would be fun to do this again tomorrow; supposedly I'm in for clear skies. I'll see how that works out...
All the best,
My dear wife and daughter and probably even the
Yesterday I took a stack of the Sun with AR2833, which is AR2824 returning for the second time around the face of ol' Sol. I took the pics at 5:14PM EST to be exact.
Today I got in at 2PM, and waited for the weather to either clear or yuck up, especially at 5:14...
As it turned out, I had haze and occasional clouds until just before 5PM. Then it cleared up a bit with a future bank of clouds coming in from the west. Fine by me. At 5:14PM I started shooting...
Full size image here
Not the best conditions or pics (big
Based upon the position of the spot and the Sun's diameter at where the spot is moving across, it looks to me to be roughly 160,000 KM's (100K miles) of movement in the past day. Please correct me if I'm wrong; I don't pretend to have a good knowledge of math. Still, looking at the image of the Earth to scale to the bottom right at just under 13000KM's (~8000miles) in diameter, I have to think it's close.
Full size image here
It would be fun to do this again tomorrow; supposedly I'm in for clear skies. I'll see how that works out...
All the best,
