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23 votes
Accepted

Does the Sun shift periodically between prograde and retrograde rotation about its axis?

That does not happen. That cannot happen on grounds of conservation of angular momentum. You might confuse this with a text talking about the Sun's magnetic field which undergoes a constant change and ...
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  • 12.3k
9 votes

Is the Sun "chemically peculiar", and if not why is HD 222925?

No, the Sun is not "chemically peculiar". (I'm not sure most astronomers would call HD 222925 chemically peculiar, either, certainly not in any of the ways discussed on the Wikipedia page.) ...
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  • 14.9k
3 votes

Is there something close to a consensus on Earth-Sun annual distance increase (speed)?

Having such a precise yardstick allowed Russian dynamicists Gregoriy A. Krasinsky and Victor A. Brumberg to calculate, in 2004, that the sun and Earth are gradually moving apart. It’s not much – just ...
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  • 28.3k
2 votes

Are we sure solar cycle is not related to the orbit of Jupiter?

Proportionate to the tidal forces that the moon exerts on the earth, the combined gravity from Jupiter (and other planets when in alignment) seem to be enough to perturb the sun's plasma. https://www....
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1 vote
Accepted

Does interplanetary magnetic field interact with the planet's own magnetic field?

Does interplanetary magnetic field interact with the planet's own magnetic field? Not really, no. Usually in magnetostatic contexts like this there will be considered to only be one magnetic field. ...
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1 vote

Is the Sun "chemically peculiar", and if not why is HD 222925?

Not chemically peculiar. Local Group stars appear similar in composition. At least, to the extent that spectroscopy (“squiggly-line interpretation”) can nail down one star, let alone star-to-Sun ...
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1 vote

python skyfield hipparcos sun mean longitude (L)

Thank you so much. Your comments made me look further, I found my answer in the code below. # # It was the mean_longitude (L) of of the sun I was after. ...
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