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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 198 matches

by Christopher
Mon Dec 23, 2019 10:01 pm
Forum: This is SolarChat !!
Topic: Winter Solstice Prominence Animation
Replies: 9
Views: 149

Re: Winter Solstice Prominence Animation

:bow2
Thank you all for the positive feedback. I very much appreciate it.
by Christopher
Mon Dec 23, 2019 1:53 am
Forum: This is SolarChat !!
Topic: Winter Solstice Prominence Animation
Replies: 9
Views: 149

Winter Solstice Prominence Animation

Seasons greetings solar friends. A beautiful weekend here in the US midwest for the winter solstice. I managed a pretty good imaging session yesterday despite the lowest possible angles. Happy holidays to you all!
https://astrob.in/bype6n/0/
by Christopher
Thu Aug 29, 2019 2:20 am
Forum: This is SolarChat !!
Topic: Prom Animation 25th August '19_Colour Added
Replies: 27
Views: 1202

Re: Prom Animation 25th August '19_Colour Added

Wow Stu, that is just plain terrific. Now one of my favorites!
by Christopher
Thu Aug 29, 2019 2:20 am
Forum: SPoD Archive
Topic: Prom Animation 25th August '19_Colour Added
Replies: 22
Views: 1002

Re: Prom Animation 25th August '19_Colour Added

Wow Stu, that is just plain terrific. Now one of my favorites!
by Christopher
Tue Aug 27, 2019 12:08 am
Forum: This is SolarChat !!
Topic: Happy birthday Alexandra Hart
Replies: 15
Views: 676

Re: Happy birthday Alexandra Hart

Happy birthday Alexandra!
by Christopher
Sun Jun 16, 2019 2:41 pm
Forum: This is SolarChat !!
Topic: Early Morning Ha Full Disk and Spicules - 16th June
Replies: 6
Views: 500

Re: Early Morning Ha Full Disk and Spicules - 16th June

Solid disks Mark. Love your readiness strategy!
by Christopher
Sat Jun 15, 2019 5:50 pm
Forum: This is SolarChat !!
Topic: Today's SUN (20190615) | TEC140 + DAYSTAR QUARK Chromosphere
Replies: 14
Views: 1816

Re: Today's SUN (20190615) | TEC140 + DAYSTAR QUARK Chromosphere

Excellent set Pedro. Super sharp WL granulation.
by Christopher
Fri Jun 14, 2019 4:31 pm
Forum: This is SolarChat !!
Topic: some animations of May 31st and June 1st
Replies: 18
Views: 1070

Re: some animations of May 31st and June 1st

Paul,
Congratulations! These are absolutely terrific animations. I always look forward to your efforts.
by Christopher
Fri Jun 14, 2019 4:25 pm
Forum: This is SolarChat !!
Topic: June 6th Session
Replies: 16
Views: 1012

Re: June 6th Session

Hi Brian,
I really like the "melting" prominence in your first few h-alpha images. Also, that is a fantastic rainbow shot.
Regards,
by Christopher
Sat May 25, 2019 3:26 pm
Forum: This is SolarChat !!
Topic: Solarchat forum extended 3 more years...
Replies: 12
Views: 861

Re: Solarchat forum extended 3 more years...

Thanks for all you do Stephen.
by Christopher
Sun May 19, 2019 7:21 pm
Forum: This is SolarChat !!
Topic: Sol from the 18th of May 2019.
Replies: 8
Views: 534

Re: Sol from the 18th of May 2019.

Nice prom shots Eric.
by Christopher
Wed May 15, 2019 12:56 pm
Forum: This is SolarChat !!
Topic: Full Disk Before Work - 14th May
Replies: 7
Views: 510

Re: Full Disk Before Work - 14th May

I admire your get up and go attitude and especially your images Mark. Excellent FDs.
by Christopher
Wed May 15, 2019 12:52 pm
Forum: This is SolarChat !!
Topic: Sunday sunshine 12th May
Replies: 10
Views: 663

Re: Sunday sunshine 12th May

Alexandra, I love that black and white close up of 2740. That is one tangled knot. I have experienced similar mysteries with the stacking software. I for one rely on its 90% foolproof defaults but struggle when a sequence presents challenges because I haven't acquired sufficient cause and effect ins...
by Christopher
Mon May 13, 2019 6:21 pm
Forum: This is SolarChat !!
Topic: Sunday Sunshine 12th May
Replies: 13
Views: 685

Re: Sunday Sunshine 12th May

Great set Mark. I especially like the white light. Terrific resolution.
by Christopher
Sat May 11, 2019 10:04 pm
Forum: This is SolarChat !!
Topic: Spots 11 May
Replies: 8
Views: 475

Re: Spots 11 May

Superb images David.
by Christopher
Sat May 11, 2019 8:44 pm
Forum: This is SolarChat !!
Topic: May 10th Spots
Replies: 13
Views: 655

Re: May 10th Spots

I love that scope Phil! Beautiful work.
by Christopher
Sat May 11, 2019 8:42 pm
Forum: This is SolarChat !!
Topic: Two Ha close ups and a white light.
Replies: 5
Views: 387

Re: Two Ha close ups and a white light.

Nice shots Brian.
by Christopher
Fri May 10, 2019 4:15 pm
Forum: This is SolarChat !!
Topic: Solar Flare 20190509
Replies: 7
Views: 519

Re: Solar Flare 20190509

Very nice shots. 2741 is looking to be on a par with 2740. Good for us!
by Christopher
Fri May 10, 2019 4:05 pm
Forum: This is SolarChat !!
Topic: A late afternoon bonus - 9 May 2019
Replies: 12
Views: 640

Re: A late afternoon bonus - 9 May 2019

Very nice disk. I'm even noticing some spicule details on the limb.
by Christopher
Thu May 09, 2019 11:18 pm
Forum: This is SolarChat !!
Topic: Animation: Cinco de Mayo Fireworks
Replies: 14
Views: 710

Re: Animation: Cinco de Mayo Fireworks

Yes, the neverending battle against dust motes...exacerbated by spring pollen and shedding trees. Perhaps they make an "autoblower" for such purposes :cool: The Trigger Threshold was 1.6 and the Discard Threshold was 2.4. I try to strike a balance on these settings based on the prevailing conditions...
by Christopher
Thu May 09, 2019 5:09 pm
Forum: This is SolarChat !!
Topic: Quick session this morning May 7th
Replies: 23
Views: 1026

Re: Quick session this morning May 7th

Beautiful work Franco. The 3D sense is amazing. Congrats on the SPOD my friend.