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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 3 matches

by KingKong852
Sat May 18, 2019 6:50 am
Forum: This is SolarChat !!
Topic: Saturday Sunshine - 4th May
Replies: 11
Views: 638

Re: Saturday Sunshine - 4th May

Cool picture mark
by KingKong852
Sat May 18, 2019 6:46 am
Forum: Solar Scope Modifications
Topic: PST Mod Reflections back off the Blocking Filter
Replies: 17
Views: 1576

Re: PST Mod Reflections back off the Blocking Filter

It seems that your progress is quite smooth, bless you.
by KingKong852
Tue May 14, 2019 3:38 am
Forum: This is SolarChat !!
Topic: h-alpha flat box?
Replies: 14
Views: 2030

Re: h-alpha flat box?

I ordered a red LED before. Before that, I still didn't think how expensive the shipping cost was. I only understood after ordering. https://www.allicdata.com/list.html?category_id=1961