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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
Thu Aug 02, 2018 7:54 am
Forum: This is SolarChat !!
Topic: ISS transit on July 30 2018
Replies: 16
Views: 1412

Re: ISS transit on July 30 2018

Thanks for the pic & video - I enjoy these!
by mattwastell
Tue Jul 31, 2018 9:01 am
Forum: This is SolarChat !!
Topic: Sol from the 30th of July 2018.
Replies: 3
Views: 480

Re: Sol from the 30th of July 2018.

On ya Eric - the proms look fantastic.
by mattwastell
Tue Jul 31, 2018 8:57 am
Forum: This is SolarChat !!
Topic: Sol from the 29th of July 2018.
Replies: 3
Views: 429

Re: Sol from the 29th of July 2018.

This is an even better collection - you must be finding some quality time with our Sun!
by mattwastell
Tue Jul 31, 2018 8:52 am
Forum: This is SolarChat !!
Topic: Today's SUN (20180730) Pillar Prom
Replies: 9
Views: 835

Re: Today's SUN (20180730) Pillar Prom

Great presentation Pedro - really good to see some limb action despite a blank face!
by mattwastell
Sun Jul 29, 2018 3:06 am
Forum: This is SolarChat !!
Topic: Total Lunar Eclipse (20180727)
Replies: 11
Views: 1152

Re: Total Lunar Eclipse (20180727)

Fantastic collection Pedro. My favourite total eclipse phase is just before the the receding shadow moves on. Thanks for the views!
by mattwastell
Fri Jul 27, 2018 8:46 am
Forum: This is SolarChat !!
Topic: CBSAP shutting down September 1st
Replies: 26
Views: 3175

Re: CBSAP shutting down September 1st

Thank you Stephen for all you (& the greater team) have done in sharing Solar science with the masses - your dedication & commitment is beyond compare. This forum has been an additional bonus in your endeavours & I truly hope it can continue into the future as a very strong community has grown. I gu...
by mattwastell
Thu Jul 26, 2018 10:09 am
Forum: This is SolarChat !!
Topic: SUN & MOON (20180720)
Replies: 18
Views: 1461

Re: SUN & MOON (20180720)

Great lunar pics Pedro - on Saturday morning (5.30am) we get a great Sun, Earth & Moon alignment - a Total Lunar Eclipse with an hour of totality! The Moon will set during this time but I hope to get a few snaps before golf.
by mattwastell
Thu Jul 26, 2018 10:04 am
Forum: This is SolarChat !!
Topic: July 24th
Replies: 13
Views: 1183

Re: July 24th

Hi Robert
The granulation pic rocks!
by mattwastell
Thu Jul 26, 2018 10:01 am
Forum: This is SolarChat !!
Topic: Large Filament | 150mm & Quark | 6562.8A | July 24th 2018
Replies: 12
Views: 1137

Re: Large Filament | 150mm & Quark | 6562.8A | July 24th 2018

Super stuff - really detailed & dynamic image - must be pleased with its debut!
by mattwastell
Thu Jul 26, 2018 9:51 am
Forum: This is SolarChat !!
Topic: Sol from the 23rd, 24th and 25th of July 2018.
Replies: 5
Views: 592

Re: Sol from the 23rd, 24th and 25th of July 2018.

Hi Eric
Thanks for the views - hope you get some clearer weather soon!
by mattwastell
Thu Jul 26, 2018 9:48 am
Forum: This is SolarChat !!
Topic: prom to July 23
Replies: 10
Views: 964

Re: prom to July 23

Nice work Paul - I enjoyed these.
by mattwastell
Thu Jul 19, 2018 9:25 am
Forum: This is SolarChat !!
Topic: A Sunrise
Replies: 12
Views: 1065

Re: A Sunrise

Thanks for the views Derek - quite the pastel palette.
by mattwastell
Wed Jul 18, 2018 10:34 pm
Forum: This is SolarChat !!
Topic: Who said there is no activity? (T250 + Ha)
Replies: 9
Views: 866

Re: Who said there is no activity? (T250 + Ha)

Excellent - I guess even the lesser activity looks great with higher mag - very cool.
by mattwastell
Wed Jul 18, 2018 10:31 pm
Forum: This is SolarChat !!
Topic: 15-07-2018 Daystar Quark very good seeing
Replies: 14
Views: 1356

Re: 15-07-2018 Daystar Quark very good seeing

Hi Ewan
Awesome image - I hope you continue to have such conditions while there is something to see!
by mattwastell
Wed Jul 18, 2018 10:21 pm
Forum: This is SolarChat !!
Topic: 17 July: Some H alpha and Ca K shots
Replies: 10
Views: 995

Re: 17 July: Some H alpha and Ca K shots

Hi Peter
Great shots - the CaK images are fantastic - thanks for sharing.
by mattwastell
Wed Jul 18, 2018 10:19 pm
Forum: This is SolarChat !!
Topic: Today's SUN (20180718) mid-afternoon again
Replies: 9
Views: 892

Re: Today's SUN (20180718) mid-afternoon again

Thanks Pedro - 20+ days without a spot - the Sun may look very blank as the busy region turns the corner over the next day or so.
by mattwastell
Mon Jul 16, 2018 5:47 am
Forum: This is SolarChat !!
Topic: July 12 - More Ha
Replies: 12
Views: 1062

Re: July 12 - More Ha

A very productive session Brian. I enjoyed all of the presented images.
by mattwastell
Mon Jul 16, 2018 5:38 am
Forum: This is SolarChat !!
Topic: Today's SUN (20180714)
Replies: 13
Views: 1145

Re: Today's SUN (20180714)

Super collection Pedro. I have not been following the football - how is Portugal going?
by mattwastell
Mon Jul 16, 2018 5:29 am
Forum: This is SolarChat !!
Topic: Second Rotation for Active Region - AR12713 - 15th July
Replies: 11
Views: 952

Re: Second Rotation for Active Region - AR12713 - 15th July

Hi Mark - the pics came out really well - we still have some things to see - it reminds me of when I got into Solar in 2007.
by mattwastell
Mon Jul 16, 2018 5:26 am
Forum: This is SolarChat !!
Topic: I keep trying
Replies: 15
Views: 1318

Re: I keep trying

Hi Donboy - it is awesome to see all images from different people & set ups. Great captures.
by mattwastell
Mon Jul 16, 2018 5:23 am
Forum: This is SolarChat !!
Topic: Sol from the 14th of July 2018.
Replies: 8
Views: 727

Re: Sol from the 14th of July 2018.

Hi Eric
A very patient session - the CaK's & proms look excellent - thanks for the views.
by mattwastell
Sat Jul 14, 2018 9:41 am
Forum: This is SolarChat !!
Topic: Partial Solar Eclipse from Hobart
Replies: 14
Views: 1302

Re: Partial Solar Eclipse from Hobart

Thanks all - the skies here are very dark & the planet show has been great - cold though!
by mattwastell
Fri Jul 13, 2018 6:54 am
Forum: This is SolarChat !!
Topic: Partial Solar Eclipse from Hobart
Replies: 14
Views: 1302

Re: Partial Solar Eclipse from Hobart

Good catch Matt.I enjoyed Hobart went to the markets last Saturday and talked to some Beekeepers.Stayed in that new Mach 1 very nice .Saw snow too a novelty for me. Cheers Derek. Thanks Derek - we have great view of snow capped Mt Wellington - snow is a novelty for sure. Funny about chatting to Bee...
by mattwastell
Fri Jul 13, 2018 6:39 am
Forum: This is SolarChat !!
Topic: Partial Solar Eclipse from Hobart
Replies: 14
Views: 1302

Re: Partial Solar Eclipse from Hobart

JohnW wrote:
Fri Jul 13, 2018 5:15 am
Well done Matt - you have the advantage of being further south than me (central Vic). You must have had good weather as well. Regards, John W.
Thanks John - I had a great reason to visit Tassie - family. I did tell them it was them first & then the eclipse :seesaw
Have a great weekend!