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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 1269 matches

by MAURITS
Wed Jan 22, 2020 6:12 am
Forum: This is SolarChat !!
Topic: Full Disc 21 January 2020
Replies: 5
Views: 45

Re: Full Disc 21 January 2020

Nice to see Rainer.
by MAURITS
Sun Jan 19, 2020 8:53 pm
Forum: This is SolarChat !!
Topic: Sol from the 18th of January 2020.
Replies: 7
Views: 79

Re: Sol from the 18th of January 2020.

A nice collection Eric.
by MAURITS
Sat Jan 18, 2020 9:39 pm
Forum: This is SolarChat !!
Topic: January 17th Session
Replies: 15
Views: 135

Re: January 17th Session

A lot y very nice images Brian.
by MAURITS
Sat Jan 18, 2020 7:46 pm
Forum: This is SolarChat !!
Topic: Sun and sea
Replies: 14
Views: 158

Re: Sun and sea

Lovely images Alexandra.
by MAURITS
Sat Jan 18, 2020 8:05 am
Forum: This is SolarChat !!
Topic: Full Disc 17 January 2020
Replies: 11
Views: 119

Re: Full Disc 17 January 2020

Nice to see Rainer.
by MAURITS
Fri Jan 17, 2020 6:19 am
Forum: This is SolarChat !!
Topic: Full Disc 16 January 2020
Replies: 8
Views: 110

Re: Full Disc 16 January 2020

Nice to see Rainer.
by MAURITS
Wed Jan 15, 2020 2:23 pm
Forum: This is SolarChat !!
Topic: Full Disk and prominence 15/01/2020
Replies: 12
Views: 162

Re: Full Disk and prominence 15/01/2020

Nicely done Salvo.
by MAURITS
Tue Jan 14, 2020 9:20 pm
Forum: This is SolarChat !!
Topic: More Cycle 25 Activity - 14th January
Replies: 9
Views: 161

Re: More Cycle 25 Activity - 14th January

Thanks for sharing Mark.
by MAURITS
Tue Jan 14, 2020 9:18 pm
Forum: This is SolarChat !!
Topic: 13-01-2020 Sun Time lapse
Replies: 7
Views: 102

Re: 13-01-2020 Sun Time lapse

Nice to see Rainer.
by MAURITS
Tue Jan 14, 2020 11:20 am
Forum: This is SolarChat !!
Topic: Full Disc 13 January 2020
Replies: 9
Views: 122

Re: Full Disc 13 January 2020

Very nice images Rainer.
by MAURITS
Tue Jan 14, 2020 11:18 am
Forum: This is SolarChat !!
Topic: Sol from the 13th of January 2020.
Replies: 8
Views: 99

Re: Sol from the 13th of January 2020.

Lovely images Eric.
by MAURITS
Tue Jan 14, 2020 10:42 am
Forum: This is SolarChat !!
Topic: Jan 13, 2020 FDs +
Replies: 15
Views: 166

Re: Jan 13, 2020 FDs +

Lovely images Phil.
by MAURITS
Mon Jan 13, 2020 5:23 pm
Forum: This is SolarChat !!
Topic: Lucky me ...
Replies: 7
Views: 165

Lucky me ...

I have some neighbors with a business in an industrial zone. This of course is always accompanied by light pollution, but in a minimum extent. When I watch in the evening some nebulae , I always have the correct filters for this kind of observation, regardless the light pollution. So this weekend a ...
by MAURITS
Mon Jan 13, 2020 6:18 am
Forum: This is SolarChat !!
Topic: Sol from the 11th of January 2020.
Replies: 8
Views: 107

Re: Sol from the 11th of January 2020.

Very nice images Eric.
by MAURITS
Sun Jan 12, 2020 9:04 pm
Forum: This is SolarChat !!
Topic: CaK disc and ARs of January 12
Replies: 12
Views: 145

Re: CaK disc and ARs of January 12

Very nice images Raf
by MAURITS
Sun Jan 12, 2020 7:19 am
Forum: This is SolarChat !!
Topic: Penumbral Eclipse of the MOON (20200110)
Replies: 20
Views: 263

Re: Penumbral Eclipse of the MOON (20200110)

Great shots Pedro.
by MAURITS
Sun Jan 12, 2020 7:17 am
Forum: This is SolarChat !!
Topic: Full Disc 11 January 2020
Replies: 14
Views: 445

Re: Full Disc 11 January 2020

Very nice to see Rainer, lovely to see the Wl.
by MAURITS
Sat Jan 11, 2020 4:18 pm
Forum: This is SolarChat !!
Topic: Today's SUN (20200111) | TV101 & LUNT60
Replies: 14
Views: 339

Re: Today's SUN (20100111) | TV101 & LUNT60

Very nice session Pedro.
by MAURITS
Sat Jan 11, 2020 6:53 am
Forum: This is SolarChat !!
Topic: Sol from the 10th of January 2020.
Replies: 7
Views: 103

Re: Sol from the 10th of January 2020.

Great Eric, here clouds, clouds and rain ...
by MAURITS
Sat Jan 11, 2020 6:51 am
Forum: This is SolarChat !!
Topic: Sol from the 9th of January 2020.
Replies: 10
Views: 122

Re: Sol from the 9th of January 2020.

Fantastic session Eric.
by MAURITS
Fri Jan 10, 2020 6:42 pm
Forum: This is SolarChat !!
Topic: Full Disk CaK/H-alpha 20200109
Replies: 12
Views: 198

Re: Full Disk CaK/H-alpha 20200109

Very nice Salvo.