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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 17951 matches

by swisswalter
Wed Jun 24, 2015 3:57 am
Forum: This is SolarChat !!
Topic: Full Disc White Light 22/06/15 + Data
Replies: 3
Views: 684

Re: Full Disc White Light 22/06/15 + Data

Hi Richard

a great report under such conditions. No, sorry it does not count , but the 21 points go to your special effort account ;)
by swisswalter
Wed Jun 24, 2015 3:54 am
Forum: This is SolarChat !!
Topic: Another from Sunday
Replies: 7
Views: 825

Re: Another from Sunday

Hi Matt

lovely shots
by swisswalter
Wed Jun 24, 2015 3:53 am
Forum: This is SolarChat !!
Topic: Flare in Motion - AR2371 - June 22, 2015
Replies: 12
Views: 1117

Re: Flare in Motion - AR2371 - June 22, 2015

Hi Nick

great animation of that flare
by swisswalter
Wed Jun 24, 2015 3:48 am
Forum: This is SolarChat !!
Topic: AR 2371 by good seeing !! yess !!!
Replies: 18
Views: 1677

Re: AR 2371 by good seeing !! yess !!!

Hi Philippe

masterpieces, congratulations
by swisswalter
Wed Jun 24, 2015 3:47 am
Forum: This is SolarChat !!
Topic: Sol from the 22nd of June with full flare.
Replies: 8
Views: 851

Re: Sol from the 22nd of June with full flare.

Hi Eric

great catch, what a flare
by swisswalter
Wed Jun 24, 2015 3:45 am
Forum: This is SolarChat !!
Topic: Some solar activity from June 22
Replies: 8
Views: 666

Re: Some solar activity from June 22

Hi Giovanny

most interesting details
by swisswalter
Wed Jun 24, 2015 3:44 am
Forum: This is SolarChat !!
Topic: Full Disc White Light 21/06/15 + Data
Replies: 2
Views: 464

Re: Full Disc White Light 21/06/15 + Data

Hi Richard

bravo, you had sunshine on ISD
by swisswalter
Wed Jun 24, 2015 3:42 am
Forum: This is SolarChat !!
Topic: Full Disc White Light 20/06/15 + Data
Replies: 2
Views: 399

Re: Full Disc White Light 20/06/15 + Data

Hi Richard

low numbers but still a fine report
by swisswalter
Wed Jun 24, 2015 3:41 am
Forum: This is SolarChat !!
Topic: Full Disc White Light 19/06/15 + Data
Replies: 3
Views: 481

Re: Full Disc White Light 19/06/15 + Data

Richard, Richard, Richard
by swisswalter
Wed Jun 24, 2015 3:41 am
Forum: This is SolarChat !!
Topic: The Sun from Sicily, june 21
Replies: 11
Views: 944

Re: The Sun from Sicily, june 21

Hi Salvatore

great ISD shots
by swisswalter
Wed Jun 24, 2015 3:39 am
Forum: This is SolarChat !!
Topic: RE: prominence eruption on the western limb
Replies: 3
Views: 602

Re: RE: prominence eruption on the western limb

Hi Tyson

thanks for the link
by swisswalter
Wed Jun 24, 2015 3:37 am
Forum: This is SolarChat !!
Topic: New Lunt 60mm pressure tune
Replies: 3
Views: 508

Re: New Lunt 60mm pressure tune

Hi John

welcome to that wonderful site. Have fun in the sun.

try using no gain, record between 1 - 20 ms
by swisswalter
Wed Jun 24, 2015 3:21 am
Forum: This is SolarChat !!
Topic: International SUNday event in Northern WI
Replies: 5
Views: 1751

Re: International SUNday event in Northern WI

Hi Bob

sorry to hear that. We too.
by swisswalter
Wed Jun 24, 2015 3:18 am
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: Significant G4 solar storm 23rd July
Replies: 5
Views: 1369

Re: Significant G4 solar storm 23rd July

Hi Stuart

a very fine report, it is always a pleasure to see your plots
by swisswalter
Tue Jun 23, 2015 4:40 am
Forum: This is SolarChat !!
Topic: AR2371 2015.06.21 (new image with 152/900 & Quark)
Replies: 17
Views: 1302

Re: AR2371 2015.06.21 with C14HD

Hi Alessandro

what a great result from the ISD
by swisswalter
Tue Jun 23, 2015 4:40 am
Forum: This is SolarChat !!
Topic: Sol from fathers day 2015.
Replies: 14
Views: 799

Re: Sol from fathers day 2015.

Hi Eric

a wonderfull result from the fathers day, just cleaning and aligning?
by swisswalter
Tue Jun 23, 2015 4:37 am
Forum: This is SolarChat !!
Topic: AR2371 mid-flare 22nd June
Replies: 12
Views: 1101

Re: AR2371 mid-flare 22nd June

Hi Stuart

a very fine catch
by swisswalter
Tue Jun 23, 2015 4:36 am
Forum: This is SolarChat !!
Topic: Holiday pics
Replies: 14
Views: 1079

Re: Holiday pics

Hi Alexandra

lovely pics, great transit. I'm so happy that you both had finally sunshine
by swisswalter
Tue Jun 23, 2015 4:33 am
Forum: This is SolarChat !!
Topic: ULTRANARROW H-a and continuum 656nm 150mm scope.
Replies: 18
Views: 1237

Re: ULTRANARROW H-a and continuum 656nm 150mm scope.

Hi Valery

wonderful details
by swisswalter
Tue Jun 23, 2015 4:30 am
Forum: This is SolarChat !!
Topic: Solar transit
Replies: 10
Views: 860

Re: Solar transit

Hi Peter

a great transit
by swisswalter
Tue Jun 23, 2015 4:28 am
Forum: This is SolarChat !!
Topic: Sun in Whitelight , 22nd June 2015 , 13:30 BST.
Replies: 4
Views: 519

Re: Sun in Whitelight , 22nd June 2015 , 13:30 BST.

Hi Steve

a very fine WL full disk
by swisswalter
Tue Jun 23, 2015 4:27 am
Forum: This is SolarChat !!
Topic: Sun in Whitelight , 18th June 2015 , 11:30 BST.
Replies: 3
Views: 481

Re: Sun in Whitelight , 18th June 2015 , 11:30 BST.

Hi Steve

a very lovely disk
by swisswalter
Tue Jun 23, 2015 4:21 am
Forum: This is SolarChat !!
Topic: Full Disks Fathers Day June 21 2015
Replies: 6
Views: 547

Re: Full Disks Fathers Day June 21 2015

Hi Robert


a great fathers day result