Horologium solarium sive brevius Solarium Augusti fuit monumentum iussu Augusti principis Romae in Campo Martio paratum et anno 10 a.C.n. deo Soli dicatum. Fuit solariorum omnium usque in tempora hodierna maximum. Obeliscus Solaris, ex Aegypto advectus, locum gnomonis implevit; ita tempora dierum indicabat umbramque suam natali principis die, i.e. 23 Septembris, in Aram Pacis iaciebat.
- Edmund Buchner, "Solarium Augusti und Ara Pacis" in Römische Mitteilungen vol. 83 (1976) pp. 319-375
- Edmund Buchner, "Horologium solarium Augusti: Vorbericht über die Ausgrabungen 1979/80" in Römische Mitteilungen vol. 87 (1980) pp. 355-373
- Edmund Buchner, Die Sonnenuhr des Augustus: Kaiser Augustus und die verlorene Republik. Berolini, 1988
- Peter J. Holliday, "Time, History, and Ritual on the Ara Pacis Augustae" in Art Bulletin vol. 72 (1990) pp. 542-557
- "Obeliscus Augusti" in Samuel Ball Platner, A Topographical Dictionary of Ancient Rome (Londinii: Oxford University Press, 1929 ~ ~) (cum adnotationibus W. Thayer)
- Paul Zanker, The Power of Images in the Age of Augustus. Ann Arbor: University of Michigan Press, 1988