<p>57 mm diameter.
</p>
For more about this gilt brass noctural, see: <a rel="nofollow" class="external text" href="http://emu.mhs.ox.ac.uk/Display.php?irn=1406">emu.mhs.ox.ac.uk/Display.php?irn=1406</a>
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/38782010@N00">takomabibelot</a>
CC BY 2.0
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/takomabibelot/3347442219/">French Nocturnal &amp; Sundial, ca. 1600 (Oxford University Museum of the History of Science, UK)</a>