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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.

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Sol from the 20th of February of 2019.

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eroel
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Sol from the 20th of February of 2019.

Post by eroel » Fri Feb 22, 2019 4:21 am

Hi:
Some FD´s in CaK and in Ha taken from México City.
Thanks for looking, the scopes were the 102mm f/9 Meade refractor fitted with a CaK PST mod, and the Solarmax 90-DS.
Wish you all a sunny weekend,
Eric.
Sol del 20 de febrero del 2019-Meade-CaK-PSTmod-1an.jpg
Sol del 20 de febrero del 2019-Meade-CaK-PSTmod-1an.jpg (707.22 KiB) Viewed 472 times
Sol del 20 de febrero del 2019-Meade-CaK-PSTmod-1inv.jpg
Sol del 20 de febrero del 2019-Meade-CaK-PSTmod-1inv.jpg (743.38 KiB) Viewed 472 times
Sol del 20 de febrero del 2019-Meade-CaK-PSTmod-2an.jpg
Sol del 20 de febrero del 2019-Meade-CaK-PSTmod-2an.jpg (732.19 KiB) Viewed 472 times
Sol del 20 de febrero del 2019-Meade-CaK-PSTmod-2inv.jpg
Sol del 20 de febrero del 2019-Meade-CaK-PSTmod-2inv.jpg (805.69 KiB) Viewed 472 times
Sol del 20 de febrero del 2019-Meade-CaK-PSTmod-2neg.jpg
Sol del 20 de febrero del 2019-Meade-CaK-PSTmod-2neg.jpg (752.54 KiB) Viewed 472 times
Sol del 20 de febrero del 2019-Solarmax 90-DS-BF30-1an.jpg
Sol del 20 de febrero del 2019-Solarmax 90-DS-BF30-1an.jpg (617.48 KiB) Viewed 472 times
Sol del 20 de febrero del 2019-Solarmax 90-DS-BF30-1inv.jpg
Sol del 20 de febrero del 2019-Solarmax 90-DS-BF30-1inv.jpg (860.34 KiB) Viewed 472 times
Sol del 20 de febrero del 2019-Solarmax 90-DS-BF30-2an.jpg
Sol del 20 de febrero del 2019-Solarmax 90-DS-BF30-2an.jpg (817.78 KiB) Viewed 472 times
Sol del 20 de febrero del 2019-Solarmax 90-DS-BF30-2inv.jpg
Sol del 20 de febrero del 2019-Solarmax 90-DS-BF30-2inv.jpg (857.49 KiB) Viewed 472 times
Sol del 20 de febrero del 2019-Solarmax 90-DS-BF30-2neg.jpg
Sol del 20 de febrero del 2019-Solarmax 90-DS-BF30-2neg.jpg (837.65 KiB) Viewed 472 times

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Re: Sol from the 20th of February of 2019.

Post by Carbon60 » Fri Feb 22, 2019 6:48 am

Another fine set of images, Eric. That’s been quite a persistent filament.

Stu.
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Re: Sol from the 20th of February of 2019.

Post by MAURITS » Fri Feb 22, 2019 6:56 am

Nice FD's Eric ...
Regards,
Maurits

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Re: Sol from the 20th of February of 2019.

Post by xn44 » Fri Feb 22, 2019 10:04 am

Good images, Eric

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Re: Sol from the 20th of February of 2019.

Post by Montana » Fri Feb 22, 2019 10:27 am

Certainly the filament is the star today, although there are some lovely tiny proms very far north :bow

Alexandra

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Re: Sol from the 20th of February of 2019.

Post by marktownley » Fri Feb 22, 2019 2:38 pm

Looking good there Eric. I'm travelling back from Italy at the minute but hopefully getting some solar observing in this weekend.
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Re: Sol from the 20th of February of 2019.

Post by Astrophil » Fri Feb 22, 2019 9:49 pm

Eric,
Great set of images!

Phil

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Re: Sol from the 20th of February of 2019.

Post by MapleRidge » Sat Feb 23, 2019 12:38 am

Superb images Eric :bow

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Re: Sol from the 20th of February of 2019.

Post by David_The_Bears_Fan » Sat Feb 23, 2019 9:31 am

Lovely disks Eric
David

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