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Eclipse observations at Sundy and island ecologies
Dyson, Eddington and Davidson’s 1920 account locates the 1919 eclipse telescope at Roça Sundy; UNESCO pages describe plant endemism on São Tomé and contrasting relief on Príncipe.
At a glance
- Eclipse plates
- The 1920 report records 16 plates and the authors’ inference that cloud thinned during totality’s final third.[1]
- Equator crossing
- A 2023 Tentative List submission places it through the centre of Ilhéu das Rolas.[2]
- Tinhosas islets
- Tinhosa Grande: 20 ha; Tinhosa Pequena: 3 ha; Ramsar designation: 21 August 2006.[5]
A place worth remembering
Cloud and plates at Roça Sundy
The 1920 report places the telescope on a walled observing plot beside the Roça Sundy house. The observers record 16 plates during totality after a heavy storm that morning on 29 May 1919; they infer that cloud cover thinned in the eclipse’s final third.[1]
Obô and the equator on São Tomé
Príncipe’s slopes and the Tinhosas islets
UNESCO’s Man and the Biosphere page links Príncipe’s change in terrain from north to south with distinct bioclimates; the island’s southern range is formed of phonolitic peaks. The latest information in Ramsar’s Tinhosas site record is from 2006. It describes the islets as uninhabited and reports a breeding community of migrating waterbirds numbering over 300,000.[4][5]
Good to know
A few clear answers before you explore.
Where was Eddington’s telescope at Roça Sundy?
The report places it in the station’s walled observing area beside the house.[1]
Where does the 2023 Tentative List entry place the equator?
Through the centre of Ilhéu das Rolas, an islet south of São Tomé.[2]
What does the Ramsar record say about Tinhosas?
The latest site information is dated 2006. The entry describes Tinhosas as uninhabited and reports a breeding community of migrating waterbirds numbering over 300,000.[5]
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