Horologium Augusti
a Pleiades
place
resource
Creators: Sara Hales, Echo Smith, Edward Keogh
Creators: Sara Hales, Echo Smith, Edward Keogh
Contributors:
Jeffrey Becker, Brady Kiesling
Copyright © The Contributors. Sharing and remixing permitted under terms of the Creative Commons Attribution 3.0 License (cc-by).
Last modified
Nov 01, 2025 12:19 PM
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History
The Horologium Augusti or Solarium Augusti was an ancient monument of the Campus Martius built during the reign of Augustus. In theory, it functioned as a giant solar marker. An obelisk relocated to Rome from Heliopolis served as the gnomon. The obelisk today stands in the Piazza di Monte Citorio.
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https://pleiades.stoa.org/places/986274170
41.9032264143, 12.4781240866
- Associated Modern Locations:
- OSM location of Piazza di San Lorenzo in Lucina (unspecified date range) accuracy: +/- 20 meters.
- Representative Locations:
- Imagery location of Augustan meridian (30 BC - AD 300) accuracy: +/- 5 meters.
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- Horologium Augusti (Latin, unspecified date range)
- Orologio di Augusto (Italian, AD 2000 - AD 2099)
- Solarium Augusti (Latin, unspecified date range)
- Horologium Augusti located near Ara Pacis Augustae (unspecified date range)
- Horologium Augusti located at Campus Martius (unspecified date range)
- Horologium Augusti located at Roma (unspecified date range)
findspot, place of finding, find place, monument
- Evidence:
- See Further:
- Related:
Pleiades
Sara Hales, Echo Smith, Edward Keogh, Jeffrey Becker, and Brady Kiesling, 'Horologium Augusti: a Pleiades place resource', Pleiades: A Gazetteer of Past Places, 2025 <https://pleiades.stoa.org/places/986274170> [accessed: 20 May 2026]
{{cite web |url=https://pleiades.stoa.org/places/986274170 |title=Places: 986274170 (Horologium Augusti) |author=Hales, S., E. Smith, E. Keogh |accessdate=May 20, 2026 12:57 pm |publisher=Pleiades}}