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An account of the trigonometrical operation, wherby the distance between the meridians of the observatories of Greenwich and Paris has been determined / By William Roy.

Institutio astronomica, juxta hypotheseis tam veterum quam Copernici & Tychonis / dictata à Petro Gassendo regio matheseos professore ; ejusdem oratio inauguralis iteratò edita.

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An account of the trigonometrical operation, wherby the distance between the meridians of the observatories of Greenwich and Paris has been determined / By William Roy.

Institutio astronomica, juxta hypotheseis tam veterum quam Copernici & Tychonis / dictata à Petro Gassendo regio matheseos professore ; ejusdem oratio inauguralis iteratò edita.