L'oggetto che si presenta in questo contributo costituisce un'integrazione al corpus relativamente poco cospicuo di orologi solari miniaturistici greco-romani. Si tratta di una meridiana conica in avorio di elefante, rinvenuta in giacitura secondaria all'interno di un contesto residenziale di età augustea nella Piazza del Duomo di Pisa. Al di là dell'unicità dell'esemplare, per il quale si fornisce un accurato studio gnomonico, unitamente a un approfondito apprezzamento dei relativi aspetti culturali, sociali e tipologici, tale scoperta contribuisce a meglio definire il livello sociale di quest'area della città tra il II e il I sec. a.C.

This article reconsiders the possible statuary of the Pantheon in Rome, both in its original Augustan form and in its later phases. It argues that the so-called ‘Algiers Relief’ has wrongly been connected with the Temple of Mars Ultor and is in fact evidence of the association of the Divus Julius with Mars and Venus in the Pantheon of Agrippa, a juxtaposition which reflects the direction of Augustan ideology in the 20s b.c. and the building's celestial purpose. This triple statue group became the focus of the later Pantheon, and its importance is highlighted by the hierarchized system of architectural ornament of the present building.

Buchner's reconstruction of the Horologium Augusti continues to be influential, despite fatal flaws demonstrated by Rodríguez-Almeida and Schütz; so we begin by reviewing the state of the evidence. There is no credible indication that Augustus or his successors built an extensive sundial, so we must conclude with Schütz that what Pliny described and what the excavations of the German Archaeological Institute (DAI) uncovered was a solar meridian line. We then proceed to discuss its significance in the context of the Augustan building programme. Since the DAI in fact discovered a Flavian reconstruction, the final question to be addressed is what purpose it served Domitian to rebuild a largely symbolic Augustan instrument that had grown inaccurate over time.