Voynich Manuscript: was the author left-handed?

I noticed that the cosmological drawings of the sun, moon and stars in folios 67v1 and 68r2 were very similar to carvings of the sun and the moon and stars on a very fine Afro-Portuguese ivory horn No.101. The horn was decorated with other European motifs, including the arms of the House of Aviz. This indicated that the horn was intended for King Emanuel I of Portugal and was carved some time during his reign(1495-1521), i.e. around the beginning of the 16th century.