Quote:
Originally Posted by hhEb09'1
Wow, that much?
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Ok, no. It may be slightly less at
7.25 deg.
Quote:
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Originally Posted by spino
AFAIK the first to discover it was Scheiner by observing sunspots. Here's a figure from his Rosa Ursine sive solis.
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This is yet another irritant issue between Galileo and Scheiner. I think it was in Galileo's
Dialogue which published shortly after the
Rosa Ursine. It is unlikely, however, that Galileo could have inserted it since any change would have likely disrupted the extensive license process he had to go through to get
Dialogue approved. [Added: it is a very important issue, however, since Galileo used the obvserved sunspot path variation as evidence for the heliocentric model. I stil don't know why he would, though.]
Yet, I think the
Rosa took almost a decade to complete and publish, so perhaps Galileo heard of it during that time. I am curious what else is known about it.
The Jesuit scholars were very favorable to Galileo until he later stepped on their toes. Once Scheiner came to Rome, things got worse due to his intense disdain for Galileo and especially the publication of his
Dialogue.
[I might have time tonight to look into this a little closer.]
Quote:
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It depicts two sets of sunspot-observations made six months apart. Sun's tilted axis and it's apparent change are marked with lines.
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That is an impressive drawing and the angles look fairly accurate.
Here is a 7.25 deg. axial tilt: [note the false false color depiction
]