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Solar Analemma. This outstanding image from Alexandra Hart taken over a period of 4 years charts the midday position of the sun in the sky throughout the year. The north–south component of the analemma results from the change in the Sun's declination due to the tilt of Earth's axis of rotation. The east–west component results from the nonuniform rate of change of the Sun's right ascension, governed by combined effects of Earth's axial tilt and orbital eccentricity.

Merry Christmas, Happy New Year and looking forward to a great solar cycle 25!

Welcome to Solar Chat! The best forum for Solar Astronomy
Moving forward from solar cycle 24 to 25

Search found 511 matches

by David_The_Bears_Fan
Sat Feb 09, 2019 4:22 pm
Forum: This is SolarChat !!
Topic: Sun 2019 02 08
Replies: 6
Views: 484

Re: Sun 2019 02 08

Love the granulation Pepe, great set of images.
by David_The_Bears_Fan
Sat Feb 09, 2019 4:20 pm
Forum: This is SolarChat !!
Topic: Sol from the 7th of February 2019.
Replies: 5
Views: 355

Re: Sol from the 7th of February 2019.

Beautiful disks Eric. Do you capture proms and "surface" features in the same exposure?
by David_The_Bears_Fan
Tue Feb 05, 2019 4:45 pm
Forum: This is SolarChat !!
Topic: AR12733 - 30th Jan
Replies: 9
Views: 678

Re: AR12733 - 30th Jan

Thanks all :bow2
by David_The_Bears_Fan
Tue Feb 05, 2019 4:45 pm
Forum: This is SolarChat !!
Topic: The Sun - 2nd Feb 2019
Replies: 8
Views: 527

Re: The Sun - 2nd Feb 2019

Thanks all for your kind comments.
by David_The_Bears_Fan
Tue Feb 05, 2019 4:43 pm
Forum: This is SolarChat !!
Topic: Sunny Saturday
Replies: 11
Views: 694

Re: Sunny Saturday

Cracking images Alexandra. Is your H alpha pst double stacked? Wish I could get such nice flat images from mine!
by David_The_Bears_Fan
Tue Feb 05, 2019 4:34 pm
Forum: This is SolarChat !!
Topic: CaK, 03022019
Replies: 17
Views: 979

Re: CaK, 03022019

Top Ca-K images Bart, well done.
by David_The_Bears_Fan
Sun Feb 03, 2019 2:50 pm
Forum: This is SolarChat !!
Topic: Lunt Stopping Making CaK Modules?
Replies: 14
Views: 963

Re: Lunt Stopping Making CaK Modules?

Hope not, love my Ca-K module. Probably my best astro purchase ever.
by David_The_Bears_Fan
Sat Feb 02, 2019 2:10 pm
Forum: This is SolarChat !!
Topic: The Sun - 2nd Feb 2019
Replies: 8
Views: 527

The Sun - 2nd Feb 2019

Cold but clear and sunny here today :cool: Behold the wonder of a round Sun today :D 20190202_Ca-K_6PaneFD.png 20190202_Ca-K_6PaneFD_ColourInvert.png 20190202_Ca-K_Prom1.png 20190202_Ca-K_Prom2.png 20190202_Ca-K_Prom3.png The couple of white light images I did need some work so will post later.
by David_The_Bears_Fan
Wed Jan 30, 2019 8:48 pm
Forum: This is SolarChat !!
Topic: The Sun - 28th Jan
Replies: 7
Views: 509

Re: The Sun - 28th Jan

Thanks all.
by David_The_Bears_Fan
Wed Jan 30, 2019 8:46 pm
Forum: This is SolarChat !!
Topic: AR12733 - 30th Jan
Replies: 9
Views: 678

Re: AR12733 - 30th Jan

You're right, it's not right is it! That what happens when I rush the processing!
by David_The_Bears_Fan
Wed Jan 30, 2019 5:20 pm
Forum: This is SolarChat !!
Topic: AR12733 - 30th Jan
Replies: 9
Views: 678

AR12733 - 30th Jan

One last look :D
20190130_Ca-K_6PaneFD.png
20190130_Ca-K_6PaneFD.png (3.33 MiB) Viewed 678 times
20190130_Ca-K_Prom1.png
20190130_Ca-K_Prom1.png (5.72 MiB) Viewed 678 times
20190130_WL_AR12733.jpg
20190130_WL_AR12733.jpg (849.02 KiB) Viewed 678 times
That's all today, session cut short by trees!
by David_The_Bears_Fan
Tue Jan 29, 2019 6:26 pm
Forum: This is SolarChat !!
Topic: The Sun - 28th Jan
Replies: 7
Views: 509

The Sun - 28th Jan

Another clear sky yesterday, the first in a few days and if the forecast is to be believed the last for a few more! Didn't want to miss the opportunity to see this AR once more before it moves around the far side. White light (Continuum) and Ca-K images shot with some half-decent proms showing in Ca...
by David_The_Bears_Fan
Fri Jan 25, 2019 5:27 pm
Forum: This is SolarChat !!
Topic: AR12733 - 23rd Jan
Replies: 11
Views: 780

Re: AR12733 - 23rd Jan

Thanks all :bow2
by David_The_Bears_Fan
Fri Jan 25, 2019 5:24 pm
Forum: This is SolarChat !!
Topic: Surprise sun and AR2733, 25th Jan
Replies: 6
Views: 524

Re: Surprise sun and AR2733, 25th Jan

Great shot Robert.
by David_The_Bears_Fan
Thu Jan 24, 2019 1:21 pm
Forum: This is SolarChat !!
Topic: AR12733 - 23rd Jan
Replies: 11
Views: 780

Re: AR12733 - 23rd Jan

Thanks all. Clouds and rain have returned today so I am glad I made the most of the decent weather while it lasted.
by David_The_Bears_Fan
Wed Jan 23, 2019 7:51 pm
Forum: This is SolarChat !!
Topic: AR12733 - 23rd Jan
Replies: 11
Views: 780

AR12733 - 23rd Jan

More sunshine here today so I managed to grab some more images of the new AR. Seeing was quite variable (which is evident in the full disk where you can see differences in sharpness between the individual panes) but I was just pleased to get another session in! Full disk was shot at native 1000mm FL...
by David_The_Bears_Fan
Wed Jan 23, 2019 2:59 pm
Forum: This is SolarChat !!
Topic: New AR 22nd Jan 2019
Replies: 7
Views: 560

Re: New AR 22nd Jan 2019

Thanks all, will try and reduce the file size in future.
by David_The_Bears_Fan
Tue Jan 22, 2019 3:40 pm
Forum: This is SolarChat !!
Topic: First image from my eclipse set
Replies: 13
Views: 905

Re: First image from my eclipse set

Eeek, -26! Not sure I would be up for that. Great image though, well done.
by David_The_Bears_Fan
Tue Jan 22, 2019 3:35 pm
Forum: This is SolarChat !!
Topic: New AR 22nd Jan 2019
Replies: 7
Views: 560

New AR 22nd Jan 2019

Didn't get much time today as no sooner had the Sun cleared the trees then the clouds moved in! Long enough though to catch a view in white light and this nice new AR.
20190122_WL_AR_Unclassified.png
20190122_WL_AR_Unclassified.png (19.08 MiB) Viewed 560 times
by David_The_Bears_Fan
Tue Jan 22, 2019 3:30 pm
Forum: This is SolarChat !!
Topic: Ca-K from 17th
Replies: 7
Views: 554

Re: Ca-K from 17th

Thanks to all for your kind comments :bow2 @Bart1805 - No, I don't use PS at all, I use Autostitch to create the mosaic after sharpening each pane in ImPPG and then make any final adjustments in GIMP. @MarkTownley - Yes, had a bit of break back end of last year but back on it now and enjoying more t...
by David_The_Bears_Fan
Mon Jan 21, 2019 1:37 pm
Forum: This is SolarChat !!
Topic: Ca-K from 17th
Replies: 7
Views: 554

Ca-K from 17th

First Ca-K image of 2019 last week. Sun just gets high enough in the sky now for me to be able to train my scope on it if the skies are clear around midday! Full disk using Skywatcher Evostar 120 (achro) / ASI178MM / Lunt B1200 diagonal. This is a 6 pane mosaic built from 6*500 frame captures, 55 fr...