A is for Arago, the name of the scientist who helped map out the Paris meridian line (François Arago (1786-1853)).  In this episode, I explore the "Rose Line" (as it was called in the Da Vinci Code), seeking out the bronze medallions along the streets of Paris, through the Louvre, and into the Paris Observatory.  Featured is the voice of Nicolas Lesté-Lasserre, a science historian and the community manager of the Observatoire de Paris. He showed me around this incredible 17th century institution, which is usually closed to the public.  Find more, including beautiful pictures of the observatory, on The Earful Tower's website.  Become a Patreon member here to support this show and get extras. The episode in this music is from Pres Maxson, featuring an original song called Le Meridien de Paris.  Get in touch to book a walking tour of Paris, or indeed the Louvre, via the contact form on The Earful Tower.