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The third column of the left row in the Basilica of Santa Maria in Aracoeliin Rome, has a hole carved in it, of probable astronomical use. The tube aimsat a point a 116 degrees of azimut, East-South-East and 17.3 degrees ofaltitude, the Sun could be aimed in that direction at 07:00 UTC of 12 octoberand 7:25 UT of march 2, but the view is obstructed by the church's building.Same situation for the 3.9 magnitude alpha Monocerotis, visible 2000 years ago,taking into account the precession. Other hypotheses on the meridianastronomical use of this hole are here reviewed. In the case of solarobservations it cannot be for meridian transits in Rome, since the lowertransits occurs now at 24.5 degrees at winter solstice; we investigate the caseof stellar transits, of declination 30.8 degrees South. Many alignments arepossible leaving the azimut as free parameter, being the columun not in itsoriginal collocation, but here we investigate only the meridian transits, andno bright stars could have been seen through that hole, taking also intoaccount the precession 2000 years ago. We conclude that this hole was probablynot used for meridian observations.

Ipotesi astronomiche sul foro della colonna augustea di Santa Maria in Aracoeli