Planetary configuration for 18 March 816. Positions believed to be based on computation for the Sun and Moon and observations for the other five planets. (S. C. Mccluskey, <i>Astronomies and Cultures in Early Medieval Europe</i>, p. 141).
<bdi><a href="https://en.wikipedia.org/wiki/en:Aratus" class="extiw" title="w:en:Aratus"><span title="ancient Greek poet">Aratus</span></a>
</bdi>
Leiden, Universiteitsbibliotheek, ms Voss. lat. Q79, fol. 93v. <a rel="nofollow" class="external text" href="https://catalogue.leidenuniv.nl/permalink/f/a8bnm1/UBL_ALMA21221657050002711">Leiden University Library Catalogue</a>