Yes, I read each and every one of Sagans books and I have his cosmos series on DVD. His death was a very sad time as his material is sooooo valuble. However, his wife is releasing a new book next month which will include some previously unpublished material by Sagan himself.
Tycho Brahe was the author of precise measurements...Johhanes Kepler murder him by mercury poisoning to obtain his charts. Investigate the latest forensic evidence of Tycho brahe's death and how Kepler was a fraud.. http://www.mhs.ox.ac.uk/tycho/index.htm
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