In astronomy, this work is noted for giving the diameter of the Sun as twice the diameter of the Earth. Of a third work "On the Differences and Similarities of the Greek and Latin Verb", we only possess an abstract by a certain Johannes, doubtfully identified with Johannes Scotus Eriugena (9th century). See editions by Ludwig von Jan (1848–1852, with a bibliography of previous editions, and commentary), Franz Eyssenhardt (1893, Teubner text), James Willis (1994, new Teubner), and R. A. Kaster (OCT and Loeb, 2011); on the sources of the "Saturnalia" see H. Linke (1880) and Georg Wissowa (1880). The grammatical treatise will be found in Jan's edition and Heinrich Keil's "Grammatici latini"; see also Georg Friedrich Schömann, "Commentatio macrobiana" (1871). Macrobius's "Saturnalia" (, "Seven Books of the Saturnalia") consists of an account of the discussions held at the house of Vettius Agorius Praetextatus during the holiday of the Saturnalia. It contains a great variety of curious historical, mythological, critical, antiquarian and grammatical discussions. "The work takes the form of a series of dialogues among learned men at a fictional banquet." A prominent lunar crater is named after Macrobius. Macrobius Cove in Antarctica is named after Macrobius. Cicero's "Dream of Scipio" described the Earth as a globe of insignificant size in comparison to the remainder of the cosmos. Many early medieval manuscripts of Macrobius include maps of the Earth, including the antipodes, zonal maps showing the Ptolemaic climates derived from the concept of a spherical Earth and a diagram showing the Earth (labeled as "globus terrae", the sphere of the Earth) at the center of the hierarchically ordered planetary spheres. (See also: flat Earth). Images from a 12th-century manuscript of Macrobius's "Commentarii in Somnium Scipionis" (Parchment, 50 ff.; 23.9 × 14 cm; Southern France). Date: ca. 1150. Source: Copenhagen, Det Kongelige Bibliotek, ms. NKS 218 4°.