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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!

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Moving forward from solar cycle 24 to 25

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Solar Analemma 2016-2019

Last post by banjo « Sun Dec 22, 2019 8:01 am
Replies: 10
by Montana » Sat Dec 21, 2019 3:28 pm

10 Replies

501 Views

Last post by banjo
Sun Dec 22, 2019 8:01 am
Mercury transit and proms

Last post by marktownley « Tue Nov 12, 2019 8:26 pm
Replies: 5
by Astrophil » Tue Nov 12, 2019 5:34 am

5 Replies

474 Views

Last post by marktownley
Tue Nov 12, 2019 8:26 pm
Proms and filament from Oct 10

Last post by marktownley « Sun Oct 13, 2019 6:42 am
Replies: 10
by gabrieli » Fri Oct 11, 2019 1:11 am

10 Replies

846 Views

Last post by marktownley
Sun Oct 13, 2019 6:42 am
A small flare on a quiet sun. 280mm scope

Last post by MapleRidge « Sat Sep 28, 2019 1:16 am
Replies: 4
by Valery » Fri Sep 27, 2019 6:57 am

4 Replies

419 Views

Last post by MapleRidge
Sat Sep 28, 2019 1:16 am
Prom Animation 25th August '19_Colour Added

Last post by DSobserver « Sun Sep 08, 2019 4:35 pm
Replies: 22
by Carbon60 » Sun Aug 25, 2019 7:44 pm

22 Replies

1008 Views

Last post by DSobserver
Sun Sep 08, 2019 4:35 pm
Walters Mountain Sunset

Last post by pedro « Mon Aug 12, 2019 9:50 am
Replies: 9
by Derek Klepp » Sat Aug 10, 2019 9:44 am

9 Replies

530 Views

Last post by pedro
Mon Aug 12, 2019 9:50 am
Solar Sunday

Last post by marktownley « Mon Jul 29, 2019 1:11 pm
Replies: 4
by Montana » Mon Jul 29, 2019 6:53 am

4 Replies

418 Views

Last post by marktownley
Mon Jul 29, 2019 1:11 pm
Sun 2019 07 07

Last post by marktownley « Sun Jul 07, 2019 3:40 pm
Replies: 1
by xn44 » Sun Jul 07, 2019 12:12 pm

1 Replies

403 Views

Last post by marktownley
Sun Jul 07, 2019 3:40 pm
All things nice

Last post by PDB « Wed Jun 26, 2019 6:46 am
Replies: 10
by Montana » Tue Jun 25, 2019 2:59 pm

10 Replies

670 Views

Last post by PDB
Wed Jun 26, 2019 6:46 am
Intes 703 for H-alpha, some experiments

Last post by MAURITS « Mon Jun 03, 2019 6:20 pm
Replies: 8
by bart1805 » Sun Jun 02, 2019 10:00 pm

8 Replies

740 Views

Last post by MAURITS
Mon Jun 03, 2019 6:20 pm
Quick session this morning May 7th

Last post by MapleRidge « Mon May 13, 2019 5:55 pm
Replies: 4
by ffellah » Wed May 08, 2019 12:13 am

4 Replies

716 Views

Last post by MapleRidge
Mon May 13, 2019 5:55 pm
AR2738 on a fine morning

Last post by marktownley « Mon Apr 15, 2019 10:30 am
Replies: 6
by Davidm » Sun Apr 14, 2019 1:10 pm

6 Replies

688 Views

Last post by marktownley
Mon Apr 15, 2019 10:30 am
ladies and gentleman the ultimate animation of March 24

Last post by banjo « Tue Apr 02, 2019 5:48 am
Replies: 11
by banjo » Mon Mar 25, 2019 1:14 pm

11 Replies

945 Views

Last post by banjo
Tue Apr 02, 2019 5:48 am
Fulldisk Sun 14-03-2019

Last post by rsfoto « Mon Mar 18, 2019 10:22 pm
Replies: 8
by rsfoto » Sat Mar 16, 2019 12:21 am

8 Replies

673 Views

Last post by rsfoto
Mon Mar 18, 2019 10:22 pm
A few days ago

Last post by MAURITS « Sat Mar 02, 2019 5:00 pm
Replies: 10
by MAURITS » Fri Mar 01, 2019 6:25 pm

10 Replies

914 Views

Last post by MAURITS
Sat Mar 02, 2019 5:00 pm
The most remarkable spots of the Cycle 24 through a large aperture.

Last post by Carbon60 « Mon Feb 11, 2019 9:41 pm
Replies: 7
by Valery » Mon Feb 11, 2019 9:41 am

7 Replies

785 Views

Last post by Carbon60
Mon Feb 11, 2019 9:41 pm
AR2733 Rounding the Limb at 150mm HA & UV-A | Jan 29th 2019

Last post by marktownley « Sat Feb 02, 2019 12:22 pm
Replies: 9
by MalVeauX » Tue Jan 29, 2019 5:08 pm

9 Replies

839 Views

Last post by marktownley
Sat Feb 02, 2019 12:22 pm
Pretty Prom from 12 Jan

Last post by marktownley « Sun Jan 20, 2019 8:49 pm
Replies: 12
by Astrophil » Tue Jan 15, 2019 6:11 pm

12 Replies

1047 Views

Last post by marktownley
Sun Jan 20, 2019 8:49 pm
Ca K and G band images take on July 1 and 8, 2018

Last post by marktownley « Sat Jan 05, 2019 6:40 pm
Replies: 8
by christian viladrich » Fri Jan 04, 2019 8:42 pm

8 Replies

889 Views

Last post by marktownley
Sat Jan 05, 2019 6:40 pm
Helium Disk: 08Aug2018 Spectroheliogram

Last post by Merlin66 « Mon Dec 24, 2018 6:26 am
Replies: 13
by p_zetner » Sun Dec 16, 2018 8:59 pm

13 Replies

1336 Views

Last post by Merlin66
Mon Dec 24, 2018 6:26 am
AR12674 through 304mm scope. Day two.

Last post by MapleRidge « Tue Dec 11, 2018 1:51 am
Replies: 9
by Valery » Fri Dec 07, 2018 4:40 am

9 Replies

1060 Views

Last post by MapleRidge
Tue Dec 11, 2018 1:51 am
animation 27 november

Last post by Carbon60 « Sat Dec 01, 2018 1:07 pm
Replies: 8
by banjo » Thu Nov 29, 2018 9:24 am

8 Replies

1030 Views

Last post by Carbon60
Sat Dec 01, 2018 1:07 pm
24Nov18 - New Sunspot in Tri-band

Last post by MapleRidge « Sun Nov 25, 2018 11:17 pm
Replies: 2
by yltansg » Sat Nov 24, 2018 1:45 pm

2 Replies

603 Views

Last post by MapleRidge
Sun Nov 25, 2018 11:17 pm
Today's SUN (20181116) with good seeing

Last post by pedro « Sun Nov 18, 2018 11:08 am
Replies: 15
by pedro » Fri Nov 16, 2018 9:07 pm

15 Replies

1084 Views

Last post by pedro
Sun Nov 18, 2018 11:08 am
Another geomagnetic storm 11th Nov 2018

Last post by MapleRidge « Wed Nov 14, 2018 2:36 pm
Replies: 9
by Carbon60 » Sun Nov 11, 2018 11:23 am

9 Replies

1218 Views

Last post by MapleRidge
Wed Nov 14, 2018 2:36 pm
Sun today 110418

Last post by marktownley « Mon Nov 05, 2018 8:13 pm
Replies: 11
by ffellah » Sun Nov 04, 2018 7:17 pm

11 Replies

1202 Views

Last post by marktownley
Mon Nov 05, 2018 8:13 pm
Today's Prominences & Active Region | HA | Nov 3rd 2018

Last post by marktownley « Sun Nov 04, 2018 9:48 am
Replies: 2
by MalVeauX » Sat Nov 03, 2018 8:28 pm

2 Replies

526 Views

Last post by marktownley
Sun Nov 04, 2018 9:48 am
27th October CaK

Last post by Carbon60 « Sun Oct 28, 2018 12:31 pm
Replies: 2
by robert » Sat Oct 27, 2018 12:18 pm

2 Replies

760 Views

Last post by Carbon60
Sun Oct 28, 2018 12:31 pm
ISS pass 19th October 2018

Last post by marktownley « Sun Oct 21, 2018 8:22 pm
Replies: 15
by Montana » Fri Oct 19, 2018 1:35 pm

15 Replies

1490 Views

Last post by marktownley
Sun Oct 21, 2018 8:22 pm
Sol from the 16th of October 2018.

Last post by marktownley « Thu Oct 18, 2018 7:41 pm
Replies: 2
by eroel » Thu Oct 18, 2018 6:16 pm

2 Replies

647 Views

Last post by marktownley
Thu Oct 18, 2018 7:41 pm
20181015-AR2724 &AR2725

Last post by marktownley « Tue Oct 16, 2018 6:22 pm
Replies: 5
by ThomasHu » Mon Oct 15, 2018 7:42 am

5 Replies

782 Views

Last post by marktownley
Tue Oct 16, 2018 6:22 pm
Today's SUN (20181013) | imaged through high clouds

Last post by marktownley « Sat Oct 13, 2018 8:31 pm
Replies: 10
by pedro » Sat Oct 13, 2018 2:50 pm

10 Replies

1037 Views

Last post by marktownley
Sat Oct 13, 2018 8:31 pm
Decent sized proms on Oct 9

Last post by marktownley « Thu Oct 11, 2018 6:32 am
Replies: 11
by gabrieli » Tue Oct 09, 2018 9:28 pm

11 Replies

1298 Views

Last post by marktownley
Thu Oct 11, 2018 6:32 am
Gorgeous Prom Groups Today, HA 120mm, Oct 7th 2018

Last post by p_zetner « Mon Oct 08, 2018 3:33 pm
Replies: 10
by MalVeauX » Sun Oct 07, 2018 2:55 pm

10 Replies

1171 Views

Last post by p_zetner
Mon Oct 08, 2018 3:33 pm
Today's SUN (20181007) | low activity again

Last post by marktownley « Sun Oct 07, 2018 1:13 pm
Replies: 1
by pedro » Sun Oct 07, 2018 12:27 pm

1 Replies

446 Views

Last post by marktownley
Sun Oct 07, 2018 1:13 pm
Today's SUN (20181003) | 4 scopes 2 cameras

Last post by pedro « Thu Oct 04, 2018 5:19 pm
Replies: 4
by pedro » Wed Oct 03, 2018 4:08 pm

4 Replies

657 Views

Last post by pedro
Thu Oct 04, 2018 5:19 pm
AR2723 September 30th

Last post by marktownley « Mon Oct 01, 2018 6:27 pm
Replies: 7
by ffellah » Sun Sep 30, 2018 6:16 pm

7 Replies

843 Views

Last post by marktownley
Mon Oct 01, 2018 6:27 pm
Today's Prominences & New Active Region with Looping Filaments! 120mm HA, Sept 29th 2018

Last post by marktownley « Sun Sep 30, 2018 11:38 am
Replies: 3
by MalVeauX » Sat Sep 29, 2018 4:28 pm

3 Replies

587 Views

Last post by marktownley
Sun Sep 30, 2018 11:38 am
Boring Sun

Last post by krakatoa1883 « Sat Sep 29, 2018 11:48 am
Replies: 5
by krakatoa1883 » Fri Sep 28, 2018 7:03 pm

5 Replies

725 Views

Last post by krakatoa1883
Sat Sep 29, 2018 11:48 am
High resolution images taken on Aug 20, 21&23th with the 300 mm solar telescope

Last post by marktownley « Fri Sep 28, 2018 5:04 am
Replies: 8
by christian viladrich » Wed Sep 26, 2018 7:47 pm

8 Replies

889 Views

Last post by marktownley
Fri Sep 28, 2018 5:04 am
Exploding arch prom from 9/19

Last post by marktownley « Tue Sep 25, 2018 7:11 pm
Replies: 12
by FlankerOneTwo » Thu Sep 20, 2018 4:50 am

12 Replies

1279 Views

Last post by marktownley
Tue Sep 25, 2018 7:11 pm
Flying over the sun eastern limb in a 280mm scope.

Last post by Montana « Mon Sep 24, 2018 9:13 am
Replies: 4
by Valery » Sun Sep 23, 2018 6:31 pm

4 Replies

687 Views

Last post by Montana
Mon Sep 24, 2018 9:13 am

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