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Thread: Johannes Hevellius, Selenographia

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    Default Johannes Hevellius, Selenographia



    These wonderful images depict the full Lunar cycle. They are found in the Johannes Hevellius work "Selenographia" in the library of the University of Vienna.

    I hope you enjoy them as much as I have.
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    Default Re: Johannes Hevellius, Selenographia

    Very interesting. It's the first time I have seen the complete progression of the phases depicted before. Normally publications only show us a single image.
    Presumably the drawings were done through his 4.7 inch "aerial" scope with a focal length of 150 feet! Focal ratio= 380.
    Chromatic aberration was as minimal as possible ( before the invention of the achromatic lens) at this huge fr but using it must have been a nightmare.
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    Default Re: Johannes Hevellius, Selenographia

    Quote Originally Posted by goldstar View Post
    Very interesting. It's the first time I have seen the complete progression of the phases depicted before. Normally publications only show us a single image.
    Presumably the drawings were done through his 4.7 inch "aerial" scope with a focal length of 150 feet! Focal ratio= 380.
    Chromatic aberration was as minimal as possible ( before the invention of the achromatic lens) at this huge fr but using it must have been a nightmare.
    I am not certain of the details at this point of his equipments, but yes, a nightmare to us I am sure. But he was wholly committed to this work. And if I understand correctly these studies were done by projection...I could be mistaken on that last point.

    I am glad you enjoyed seeing these...
    My inspiration came from Gabby, so I cannot take any real credit here.

    The entire volume may be viewed here.

    https://fedora.phaidra.univie.ac.at/...def:Book/view#
    Last edited by Eagleheaf; 01-13-2018 at 09:56 PM.
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    Messier count 78

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    Default Re: Johannes Hevellius, Selenographia

    He actually rarely used the telescope for scientific observation, prefering to use quadrant, alidade and projection.
    He is considered the last of the greats to do visual scientific work.
    Refractors: Antares 105 f/15, Bresser 102XL f/13.2, Celestron 102 f/6.5, 2-150 f/8, Stellarvue NHNG 80 f/6.9, TAL 100RS f/10, TS 102 f/11, Vixen SD115s f/7.7
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    Ya gotta keep this Apo/Achro thing in some balance of perspective. Apos are awesome, but long focus Achros aren't that far behind them - Siriusandthepup (CN)

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