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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 4876 matches

by mattwastell
Tue May 07, 2019 9:37 am
Forum: This is SolarChat !!
Topic: 6th May, flare
Replies: 7
Views: 436

Re: 6th May, flare

Excellent! Great to see some white! We will take some C1.5 action! Sweet disc work!
by mattwastell
Tue May 07, 2019 9:35 am
Forum: This is SolarChat !!
Topic: storm on the sun May 6 PART 2 (NEW)
Replies: 15
Views: 816

Re: storm on the sun May 6 (new)

Hi Paul - that is a very textural animation - thanks for the movie!
by mattwastell
Tue May 07, 2019 9:33 am
Forum: This is SolarChat !!
Topic: May the 6th Solar Activity
Replies: 8
Views: 455

Re: May the 6th Solar Activity

Hi David
That is a great series - I had my first session on Monday - saw some of the little pops & fluff - glad to see the pop on your CaK!
by mattwastell
Fri Apr 12, 2019 9:09 am
Forum: This is SolarChat !!
Topic: Region today 11 April
Replies: 14
Views: 685

Re: Region today 11 April

Thanks for the views - I also hope to get out this weekend!
by mattwastell
Fri Apr 12, 2019 9:07 am
Forum: This is SolarChat !!
Topic: Images from April 10th
Replies: 9
Views: 498

Re: Images from April 10th

Nice work - the Sun looks so much better at the moment!
by mattwastell
Fri Apr 12, 2019 9:04 am
Forum: This is SolarChat !!
Topic: Quick session early doors 11/04/2019 Tal/PST mod
Replies: 11
Views: 662

Re: Quick session early doors 11/04/2019 Tal/PST mod

Hi David - that is a superb shot - hope you get through more of your data - very nice to see some Solar action too!
by mattwastell
Sun Feb 24, 2019 8:39 am
Forum: This is SolarChat !!
Topic: Our dear Richard Bailey
Replies: 12
Views: 856

Re: Our dear Richard Bailey

So sad to read this - I did enjoy Richard's contribution to my Solar world. RIP.
by mattwastell
Sun Feb 24, 2019 8:26 am
Forum: This is SolarChat !!
Topic: First session of the year
Replies: 7
Views: 550

Re: First session of the year

Hi David - triumphant return! I have yet to break my 2019 drought.
by mattwastell
Sun Feb 24, 2019 8:23 am
Forum: This is SolarChat !!
Topic: Filament 23 2 2019
Replies: 7
Views: 510

Re: Filament 23 2 2019

Hello Pepe
Thanks for the fantastic views!
by mattwastell
Sun Feb 24, 2019 8:22 am
Forum: This is SolarChat !!
Topic: Saturday Sunshine - 23rd February
Replies: 15
Views: 846

Re: Saturday Sunshine - 23rd February

Excellent images Mark - the Filament close ups are sweet!
by mattwastell
Sat Feb 23, 2019 6:22 am
Forum: This is SolarChat !!
Topic: Today's Filament & Plage, Full Disc | HA | Feb 21 2019
Replies: 20
Views: 953

Re: Today's Filament & Plage, Full Disc | HA | Feb 21 2019

Great first out session - looks like you were dodging clouds a fair bit! Happy second light.
by mattwastell
Tue Feb 19, 2019 11:39 am
Forum: This is SolarChat !!
Topic: halpha sun of February 18th
Replies: 5
Views: 450

Re: halpha sun of February 18th

Great discs - number 2 is excellent - thanks for sharing Stephane.
by mattwastell
Tue Feb 19, 2019 11:33 am
Forum: This is SolarChat !!
Topic: 2017 Feb 17. Dark filament through a 6" aperture.
Replies: 12
Views: 816

Re: 2017 Feb 17. Dark filament through a 6" aperture.

Thanks for the pics Valery - conditions may not have been perfect but they are eye candy for us!
by mattwastell
Tue Feb 19, 2019 11:30 am
Forum: This is SolarChat !!
Topic: Solar images of February 16th
Replies: 10
Views: 664

Re: Solar images of February 16th

Thanks for the views Raf - the Filament looks great - glad to see some activity around.
by mattwastell
Tue Feb 19, 2019 11:28 am
Forum: This is SolarChat !!
Topic: Solar highlights from Feb. 17, 2019
Replies: 16
Views: 941

Re: Solar highlights from Feb. 17, 2019

Hi Phil - just seen these - sweet!
by mattwastell
Tue Feb 19, 2019 11:26 am
Forum: This is SolarChat !!
Topic: Feb 16th Session
Replies: 13
Views: 772

Re: Feb 16th Session

Hi Brian - I love seeing your winter pics - we have just had a record 30 days over 30 degrees here! PS. the Solar pics are great too!
by mattwastell
Tue Feb 19, 2019 11:23 am
Forum: This is SolarChat !!
Topic: February 18 Full Disk and 3 hour time lapse
Replies: 10
Views: 709

Re: February 18 Full Disk and 3 hour time lapse

Hello Rainer
That is a fantastic disc - may even get out over the weekend - there is a bit more going on than I was aware of.
by mattwastell
Tue Feb 19, 2019 11:22 am
Forum: This is SolarChat !!
Topic: Sol from the 18th of February 2019.
Replies: 8
Views: 525

Re: Sol from the 18th of February 2019.

Hi Eric
It has been a while since I dropped by - great images!
by mattwastell
Sun Oct 21, 2018 4:14 am
Forum: This is SolarChat !!
Topic: Prominence menagerie from yesterday's Sun
Replies: 5
Views: 643

Re: Prominence menagerie from yesterday's Sun

Hi Dave

They turned out really well - thanks!
by mattwastell
Sun Oct 21, 2018 3:54 am
Forum: This is SolarChat !!
Topic: Spotless 12724 & 12725 and small prom
Replies: 8
Views: 834

Re: Spotless 12724 & 12725 and small prom

Nice prom work - looks like a worthy target.
by mattwastell
Sun Oct 21, 2018 3:53 am
Forum: This is SolarChat !!
Topic: Sol from the 16th of October 2018.
Replies: 9
Views: 920

Re: Sol from the 16th of October 2018.

Hi Eric

Never apologise for too many pics - I have not had a session in some time but I see the proms are still quite the feature during this quiet Sun.

Thanks for the images.
by mattwastell
Sun Oct 21, 2018 3:49 am
Forum: This is SolarChat !!
Topic: Today's SUN (20181020) | 6 scopes + Jet transit
Replies: 9
Views: 821

Re: Today's SUN (20181020) | 6 scopes + Jet transit

Thanks for the views Pedro - very quiet in Ha!
by mattwastell
Sun Oct 21, 2018 3:45 am
Forum: This is SolarChat !!
Topic: ISS pass 19th October 2018
Replies: 17
Views: 1469

Re: ISS pass 19th October 2018

Great stuff Alexandra - transits are always great to capture - awesome Ha discs BTW.
I know the feeling about a long spell without scoping - poor weather, little Solar activity & other duties have kept me away for some time. Maybe soon!
by mattwastell
Sun Oct 21, 2018 3:45 am
Forum: SPoD Archive
Topic: ISS pass 19th October 2018
Replies: 15
Views: 1491

Re: ISS pass 19th October 2018

Great stuff Alexandra - transits are always great to capture - awesome Ha discs BTW.
I know the feeling about a long spell without scoping - poor weather, little Solar activity & other duties have kept me away for some time. Maybe soon!
by mattwastell
Thu Aug 02, 2018 8:41 am
Forum: This is SolarChat !!
Topic: ISS Solar Transit with NO filter
Replies: 6
Views: 771

Re: ISS Solar Transit with NO filter

Great stuff - must have been extremely smokey - we have seen your fires on our local news - I hope you are safe. What was your unfiltered set up?