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Galileo's sunspot sketches sequenced in a movie

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#1 Jason H.

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Posted 13 February 2009 - 09:06 AM

Although I'm not the first, I made the following movie (~4.7 megs) using online images of Galileo's drawings of sunspots in the summer of 1612


Happy 400th birthday of the telescope!

Regards, Jason H.

#2 Vincent Becker

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Posted 13 February 2009 - 09:18 AM

This is absolutely wonderful. A movie of the sun 400 years old!

#3 CarlosEH


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Posted 13 February 2009 - 09:20 AM


Thank you for your movie of Galileo's sunspot sketches. To think that this great Italian astronomer used an instrument no better than many finders on instruments today (and probably much worse) to make his wonderful discoveries of the heavens.


#4 markseibold


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Posted 13 February 2009 - 01:13 PM


Nice sequnced movie of many of Galileo's sunspot drawings. Thanks for sharing this. It gives me a deeper impression for what he was doing and what he gave to us in education.

It is interesting to note that he did not have proper filtration to protect his eyes and this eventually destroyed his eyesight.

Imagine if Galileo had seen the sun in h-alpha light! It makes me wonder how the understanding of the sun may have changed the world over in the past 400 years.

Imagine that many people in our modern world today have never seen the suns prominences through an h-alpha filter and how it might change their perception of the sun.


#5 frank5817



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Posted 13 February 2009 - 02:48 PM


Very impressive. The great sketchers of the past have made many astronomical sketches that can be animated in this manner. I think you are going to get very busy.

Frank :)

#6 rodelaet



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Posted 13 February 2009 - 03:48 PM


That is soo cool!

Galileo's discoveries have pulled mankind out of the center of the universe onto an unkown route. And we're gaining velocity with every new discovery.

Did Galileo use projection or what kind of solar filter those days?

#7 StarStuff1



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Posted 15 February 2009 - 09:51 PM

Thanks for the cool movie Jason!

Hi Rony,
My understanding is that Galileo first only observed the Sun early in the morning and late in the afternoon when it was observed through the thicker atmosphere. Later in life he used solar projection. About the age of 72 he became blind from cataracts and glaucoma, not from directly observing the Sun. Some of his contemporaries may not have been so lucky.

#8 cildarith



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Posted 16 February 2009 - 02:22 AM

Did Galileo use projection or what kind of solar filter those days?

As Mark noted above, Galileo made his observations directly through the eyepiece - an act that eventually cost him his eyesight. These observations were dearly bought...

Thank you for preparing and sharing your animation, Jason!

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