ga nassi da ke ƙasa sannan ka amsa tambayar daga baya a cikin yare ɗaya kamar nassi: Passage: Kodayake Helenawa da Romawa sun yi abubuwa da yawa don haɓaka fasahar agogon ruwa, har yanzu suna ci gaba da amfani da agogon inuwa. Masanin lissafi da masanin taurari Theodosius na Bithynia, alal misali, an ce ya ƙirƙira agogon rana na duniya wanda ya kasance daidai a ko'ina a duniya, kodayake ba a san komai game da shi ba. Wasu sun rubuta game da agogon rana a cikin lissafi da adabin lokacin. Marcus Vitruvius Pollio, marubucin Roman na De Architectura, ya rubuta game da ilimin lissafi na gnomons, ko sundial blades. A lokacin mulkin Sarkin sarakuna Augustus, Romawa sun gina mafi girman agogon rana da aka taɓa ginawa, Solarium Augusti. Gnomon dinsa wani obelisk ne daga Heliopolis. Hakazalika, an yi amfani da obelisk daga Campus Martius a matsayin gnomon don agogon rana na Augustus.
masanin lissafi da masanin taurari