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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 7327 matches

by pedro
Tue Jan 21, 2020 8:03 pm
Forum: This is SolarChat !!
Topic: Kanzelhoehe Solar Observatory
Replies: 5
Views: 114

Re: Kanzelhoehe Solar Observatory

Impressive observatory and gallery of jet transits Mark
by pedro
Tue Jan 21, 2020 2:12 pm
Forum: This is SolarChat !!
Topic: Solar Imaging Tutorial, Focus, Flat Calibration, Exposure | Jan 20th 2020
Replies: 7
Views: 88

Re: Solar Imaging Tutorial, Focus, Flat Calibration, Exposure | Jan 20th 2020

Thanks Marty, great video

I have to say that I never use flats. Sometimes I apply an artificial flat but mostly I try to keep my CCDs and CMOs very clean. I do not have the gradients that are very evident in PST mods
by pedro
Mon Jan 20, 2020 9:25 pm
Forum: This is SolarChat !!
Topic: Today's SUN (20200119) | TV101, LUNT60, LUNT60 Ca-K
Replies: 13
Views: 204

Re: Today's SUN (20200119) | TV101, LUNT60, LUNT60 Ca-K

Nice one Matt, it's the interior of my dome. I will have to paint it again
by pedro
Mon Jan 20, 2020 10:27 am
Forum: This is SolarChat !!
Topic: Today's SUN (20200119) | TV101, LUNT60, LUNT60 Ca-K
Replies: 13
Views: 204

Re: Today's SUN (20200119) | TV101, LUNT60, LUNT60 Ca-K

Thanks a lot guys for your comments

Not much to see apart from a new AR and a big faint prom

Seeing conditions were bad to fair and I missed yet another jet transit (I was focussing)
by pedro
Sun Jan 19, 2020 1:13 pm
Forum: This is SolarChat !!
Topic: Today's SUN (20200119) | TV101, LUNT60, LUNT60 Ca-K
Replies: 13
Views: 204

Today's SUN (20200119) | TV101, LUNT60, LUNT60 Ca-K

Today's SUN (20200119) | TV101, LUNT60, LUNT60 Ca-K WEB LINK: http://re.apaaweb.com/sun_h_alpha_2020-01.html https://youtu.be/lMev7dzSn5U Solar imaging session (20200119) | Pedro RE' TV101, LUNT60, LUNT60 Ca-K GS3-U3-28S4M-C, Takahashi EM-400 Kodak PixPro 4K http://re.apaaweb.com http://re.apaaweb.c...
by pedro
Sun Jan 19, 2020 10:14 am
Forum: This is SolarChat !!
Topic: Today's SUN (20200111) | TV101 & LUNT60
Replies: 14
Views: 339

Re: Today's SUN (20200111) | TV101 & LUNT60

Thanks Stu

It's sunny here as well. I just finished another imaging session
by pedro
Sat Jan 18, 2020 9:05 pm
Forum: This is SolarChat !!
Topic: Sun and sea
Replies: 14
Views: 158

Re: Sun and sea

Beautiful photos Alexandra
by pedro
Sat Jan 18, 2020 1:21 pm
Forum: Solar Astronomy Equipment Reviews
Topic: SolarQuest review
Replies: 37
Views: 6870

Re: SolarQuest review

Daystar Quark Chromosphere SWSolarQuest mount + FS60C/SM60/BF10
by pedro
Sat Jan 18, 2020 1:17 pm
Forum: This is SolarChat !!
Topic: Lunt Heating Module test
Replies: 7
Views: 123

Re: Lunt Heating Module test

interesting stuff, please keep us posted
by pedro
Fri Jan 17, 2020 10:46 am
Forum: This is SolarChat !!
Topic: Today's SUN (20200111) | TV101 & LUNT60
Replies: 14
Views: 339

Re: Today's SUN (20200111) | TV101 & LUNT60

Thanks Marty
by pedro
Fri Jan 17, 2020 10:08 am
Forum: This is SolarChat !!
Topic: Penumbral Eclipse of the MOON (20200110)
Replies: 20
Views: 263

Re: Penumbral Eclipse of the MOON (20200110)

thanks again guys

Lens cap off can be an issue as well
by pedro
Fri Jan 17, 2020 10:06 am
Forum: This is SolarChat !!
Topic: Solar Processing Tutorial (Rapid Workflow) for HA | Jan 16th 2020
Replies: 9
Views: 147

Re: Solar Processing Tutorial (Rapid Workflow) for HA | Jan 16th 2020

looking forward to watch the tutorial Marty, thanks for sharing
by pedro
Thu Jan 16, 2020 1:32 pm
Forum: This is SolarChat !!
Topic: Sol from the 15th of January 2020.
Replies: 11
Views: 149

Re: Sol from the 15th of January 2020.

great FD Ca-K & H-alpha images Eric

abrazo
by pedro
Wed Jan 15, 2020 1:18 pm
Forum: This is SolarChat !!
Topic: 13-01-2020 Sun Time lapse
Replies: 7
Views: 102

Re: 13-01-2020 Sun Time lapse

Great stuff Rainer
by pedro
Wed Jan 15, 2020 11:13 am
Forum: This is SolarChat !!
Topic: Penumbral Eclipse of the MOON (20200110)
Replies: 20
Views: 263

Re: Penumbral Eclipse of the MOON (20200110)

Thanks a lot Matt

best regards and have a great 2020
by pedro
Tue Jan 14, 2020 9:50 am
Forum: This is SolarChat !!
Topic: Penumbral Eclipse of the MOON (20200110)
Replies: 20
Views: 263

Re: Penumbral Eclipse of the MOON (20200110)

Thanks Alexandra

I knew something was going on, and you're right, I blamed the equipment...

I should not have deleted the first videos. I tried to get them back but it was not that simple since I recorded other stuff on the same directory.

best regards
by pedro
Mon Jan 13, 2020 3:41 pm
Forum: This is SolarChat !!
Topic: Penumbral Eclipse of the MOON (20200110)
Replies: 20
Views: 263

Re: Penumbral Eclipse of the MOON (20200110)

Gracias Eric

Abrazo
by pedro
Mon Jan 13, 2020 11:37 am
Forum: This is SolarChat !!
Topic: Penumbral Eclipse of the MOON (20200110)
Replies: 20
Views: 263

Re: Penumbral Eclipse of the MOON (20200110)

Actually I have a nice story to tell. I thought that something was wrong with one of my setups (TV101). Part of the Moon was darker and I had the hair drier ready to try to solve the problem. I was not aware that a penumbral eclipse was happening (shame on me, I should know). Having said this I dele...
by pedro
Mon Jan 13, 2020 11:30 am
Forum: This is SolarChat !!
Topic: Today's SUN (20200111) | TV101 & LUNT60
Replies: 14
Views: 339

Re: Today's SUN (20200111) | TV101 & LUNT60

Thanks guys

Mark, I had 2C inside the dome but fortunately no wind. It can be cold in Portugal too

best regards to all
by pedro
Sun Jan 12, 2020 10:18 am
Forum: This is SolarChat !!
Topic: Penumbral Eclipse of the MOON (20200110)
Replies: 20
Views: 263

Re: Penumbral Eclipse of the MOON (20200110)

Thanks a lot Maurits
by pedro
Sat Jan 11, 2020 11:32 pm
Forum: This is SolarChat !!
Topic: Visual Solar Observing
Replies: 17
Views: 290

Re: Visual Solar Observing

Hi James

I always observe visually the sun in all my observing sessions. Sometimes I use a binoviewer as well. Usually I do it before going to the dome to image (PST or Taka FS60 + SM60)
by pedro
Sat Jan 11, 2020 10:16 pm
Forum: This is SolarChat !!
Topic: Penumbral Eclipse of the MOON (20200110)
Replies: 20
Views: 263

Re: Penumbral Eclipse of the MOON (20200110)

Thanks

The eclipse was more pronounced around 19:10 UTC. I started imaging later than that
by pedro
Sat Jan 11, 2020 9:56 pm
Forum: This is SolarChat !!
Topic: Today's SUN (20200111) | TV101 & LUNT60
Replies: 14
Views: 339

Re: Today's SUN (20200111) | TV101 & LUNT60

Thanks a lot Guys

The date was corrected